CCAPP Cosmolunch

Nov 5th, 2025

• [Chloe] Zhou et al, The ASTRID Simulation at z=0: from Massive Black Holes to Large-scale Structure

• [Nihar] Xu et al, Constraining baryonic feedback and cosmology from DES Y3 and Planck PR4 6×2pt data. I. ΛCDM models

October 29th, 2025

• [Nicole] Sunseri et al, Supermassive Black Hole Growth in Massive Galaxies at Cosmic Dawn

• [Misha] Zaborowski et al, H0  Without the Sound Horizon (or Supernovae): A 2% Measurement in DESI DR1

October 22nd, 2025

• [Xinyi] Sharma et al, Probing baryonic feedback and cosmology with 3×2-point statistic of FRBs and galaxies

• [Katherine] Yoon et al, KiDS-1000 cosmic shear reanalysis using MetaCalibration

October 15th, 2025

• Cancelled, COSMO-25

October 8th, 2025

• Special Seminar: Kevin Fanning, SLAC/Rubin Observatory

Title: One Hundred and One Nights: Commissioning the Vera C Rubin Observatory

Abstract:  This talk will present the progress constructing and commissioning the Vera C. Rubin Observatory with a particular focus on the role an astronomer plays in this process. The talk will begin with a brief history of imaging surveys, motivating the construction of the Rubin Observatory. This will continue with describing some important phases and milestones of commissioning as well as presenting many of the major systems that constitute the observatory. The talk will conclude with a look ahead for science with Rubin Observatory and how data, including the already available DP1, can be accessed.

October 1st, 2025

• Special Seminar: Rafael Charles Gomes, University of Pennsylvania

Title: Cosmological Constraints with Second and Third-order Shear Statistics

Abstract: Weak lensing higher-order statistics have recently been applied to Stage III surveys to capture the non-Gaussian information of the shear field. While many approaches rely on simulations, certain statistics can be modeled analytically, such as the bispectrum and its real-space counterpart, the three-point correlation function. I will present the works of Gomes et al. (2025a, 2503.03964), Gomes et al. (2025b, 2508.14018), and Sugiyama et al. (2025, 2508.14019), where we develop a framework for the joint cosmological analysis of the two-point correlation function and the skewness of the mass aperture statistic, a compressed representation of the full three-point function. Applying this methodology to DES and HSC data, we obtain a significant improvement in cosmological constraints. I will also discuss ongoing developments in the modeling of intrinsic alignments, which will be essential for future third-order shear analyses.

September 24th, 2025

• [Peter] Kou and Lewis, Unified dark fluid with null sound speed as an alternative to phantom dark energy

• [Nihar] Siegel et al., Joint X-ray, kinetic Sunyaev-Zeldovich, and weak lensing measurements: toward a consensus picture of efficient gas expulsion from groups and clusters

September 17th, 2025

• CCAPP Symposium!

September 10th, 2025

• [Molly]Willem Elbers, Rapid late-time reionization: constraints and cosmological implications

• [Meagan] Herbold et al., Generation of Lognormal Synthetic Lyman-α Forest Spectra for P1D Analysis

September 3rd, 2025

• [Nicole] Chen and Ashfordi, Where are all the dark galaxies? Predicting galaxy/halo locations from their bright neighbors

• [Claire] Wang et al., Galaxy Group Spin Alignment with Cosmic Filament in the TNG Simulation

August 27th, 2025

• Orientation

• [Nihar] Sugiyama and Park, Data Compression with Noise Suppression for Inference under Noisy Covariance

Stats for Fall 2025 (so far):

April 16th, 2025

• [Mikel] Page and Carrera., An improved method of constructing binned luminosity functions

April 7th, 2025

• Ohio Cosmic Connections Workshop!

March 26th, 2025

• [Meagan] Lodha et al., Extended Dark Energy analysis using DESI DR2 BAO measurements 

• [Molly] Kumar Khan et al., Stronger Constraints on Primordial Black Holes as Dark Matter Derived from the Thermal Evolution of the Intergalactic Medium over the Last Twelve Billion Years 

March 19th, 2025

• [Gabe] Good and Linder, Cosmic Acceleration from Nothing

• [Nihar] ACT DR6 Primary CMB Results

March 5th, 2025

• [Chris] SPHERE-X launch & overview, https://arxiv.org/pdf/2404.11017

February 26th, 2025

• [Emily] Tamayo et al., Equivalence of Dark Energy Models: A Theoretical and Bayesian Perspective

February 19th, 2025

• [Naim] Shaw et al., Forecasting the Detection of Lyman-alpha Forest Weak Lensing from the Dark Energy Spectroscopic Instrument and Other Future Surveys

February 12th, 2025

• [Nihar] Quataert and Hopkins, Cosmic Ray Feedback in Massive Halos: Implications for the Distribution of Baryons

February 5th, 2025

• [Molly] Mason et al., Constraints on the z∼6−13 intergalactic medium from JWST spectroscopy of Lyman-alpha damping wings in galaxies

• [Erik] Jiang et al., Can the sound horizon-free measurement of H0 constrain early new physics?

January 29th, 2025

• [Nicole] Despali et al., Introducing the AIDA-TNG project: galaxy formation in alternative dark matter models

• [Gabe] Pavičević et al., Constraints on Primordial Magnetic Fields from the Lyman-α forest

January 22nd, 2025

• [Meagan]  Ondro et al., Playground of Lognormal Seminumerical Simulations of~the~Lyman~α Forest: Thermal History of the Intergalactic Medium

• [Naim] Walther et al., Emulating the Lyman-Alpha forest 1D power spectrum from cosmological simulations: New models and constraints from the eBOSS measurement

January 15th, 2025

• [Charuhas]  Gould et al., Cosmology on point: modelling spectroscopic tracer one-point statistics

• [Erik] Lewis et al., Understanding acoustic scale observations: the one-sided fight against Λ

December 4th, 2024

• [Peter]  Duncan et al., Avoiding lensing bias in cosmic shear analysis

November 20th, 2024

• [Gabe]  Saha et al., Hunting Primordial Black Hole Dark Matter in Lyman-α Forest

• [Mikel]  Laurent et al., Clustering of quasars in SDSS-IV eBOSS : study of potential systematics and bias determination

November 13th, 2024

• [Nihar]  Zhong et al., Fast Generation of Weak Lensing Maps with Analytical Point Transformation Functions

• [Molly]  Meiksin et al., The effect of helium reionization on the Lyman-alpha forest hydrogen flux statistics 

November 6th, 2024

• [Tony]  Semenzato et al., Cross-Correlating the Universe: The Gravitational Wave Background and Large-Scale Structure

October 30th, 2024

• [Peter]  Mentasti et al., Cosmic Shimmering: the Gravitational Wave Signal of Time-Resolved Cosmic Shear Observations

• [Naim] Nakashima et al., Lyman-α forest power spectrum and its cross-correlation with dark matter halos in different astrophysical models

October 23rd, 2024

• [Meagan]  Chaves-Montero et al., ForestFlow: predicting the Lyman-α forest clustering from linear to nonlinear scales

• [Wynne] Tillman et al., The Effects of AGN Feedback on the Lyman-α Forest Flux Power Spectrum

October 16th, 2024

• [Molly]  Jin et al., A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Supports Earlier Reionization around [OIII] Emitters

• [Erik] McCarthy et al., The Atacama Cosmology Telescope: Large-scale velocity reconstruction with the kinematic Sunyaev--Zel'dovich effect and DESI LRGs

October 9th, 2024

• [Naim]  Benty-fields cleanup:

  1. https://arxiv.org/pdf/2409.13583

  2. https://arxiv.org/pdf/2409.08367

  3. https://arxiv.org/pdf/2409.11400

  4. https://arxiv.org/pdf/2404.08056

  5. https://arxiv.org/pdf/2408.06153

October 2nd, 2024

• [Naim]  Scolnic et al., The Hubble Tension in our own Backyard: DESI and the Nearness of the Coma Cluster

• [Nihar] Anbajagane et al., Map-level baryonification: Efficient modelling of higher-order correlations in the weak lensing and thermal Sunyaev-Zeldovich fields

September 18th, 2024

• [Tony]  Paper about Alpha Magnetic Spectrometer

• [Katherine] Salcido et al., Implications of feedback solutions to the S8 tension for the baryon fractions of galaxy groups and clusters

September 11th, 2024

• [Peter] Taylor et al., CombineHarvesterFlow: Joint Probe Analysis Made Easy with Normalizing Flows

• [Gabe] Vasquez et al., Corrections to Hawking radiation from asteroid-mass primordial black holes: description of the stochastic charge effect in quantum electrodynamics

September 4th, 2024

• [Andrew] Giovanetti et al., Cosmological Parameter Estimation with a Joint-Likelihood Analysis of the Cosmic Microwave Background and Big Bang Nucleosynthesis

• [Katherine] Efstathiou, Evolving Dark Energy or Supernovae Systematics?

August 28th, 2024

• Orientation

• [Nihar] Krause et al., A Parameter-Masked Mock Data Challenge for Beyond-Two Point Galaxy Clustering Statistics

September 20, 2023

• [Naim] Cosmological Constraints from the eBOSS Lyman-α Forest using the PRIYA Simulations

• [Erik] Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension

September 13, 2023

• [Nihar] Determining the Baryon Impact on the Matter Power Spectrum with Galaxy Clusters

• [Heyang] Machine-learning recovery of foreground wedge-removed 21-cm light cones for high-z galaxy mapping

September 6, 2023

• [Gabe] Probing Early Modification of Gravity with Planck, ACT and SPT

August 30, 2023

• [Naim] Data Compression and Inference in Cosmology with Self-Supervised Machine Learning

• [Naim] First measurement of the Mg II forest correlation function in the Epoch of Reionization

August 23, 2023

• [Chun-Hao] The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys

April 19, 2023

• [Nihar] Perez et al., Constraints on the Epoch of Reionization with Roman Space Telescope and the Void Probability Function of Lyman-Alpha Emitters 

• [Andrei] Linder, Benchmarks of Dark Energy 

April 12, 2023

• [Gabe] Hill & Bolliet, Did the Universe Reheat After Recombination? 

April 5, 2023

• [Makana] 

• [Naim] Escudero et al., Axion Star Explosions: A New Source for Axion Indirect Detection 

March 29, 2023

• Marunicci, Non-Gaussian assembly bias from a semi-analytic galaxy formation model 

• Barreira & Krause, Towards optimal and robust fNL constraints with multi-tracer analyses 

March 22, 2023

• [Beverly] Kwan et al., Galaxy Clustering in the Mira-Titan Universe I: Emulators for the redshift space galaxy correlation function and galaxy-galaxy lensing 

• [Naim] Zhao, ast Correlation Function Calculator -- A high-performance pair counting toolkit 

March 1, 2023

• [Chun-Hao] Lin et al., Abundance matching analysis of the emission line galaxy sample in the extended Baryon Oscillation Spectroscopic Survey  

February 22, 2023

• Johannes Lange visiting. https://github.com/johannesulf/nautilus

February 8, 2023

• [Beverly] Yao et al., DESI and DECaLS (D&D): galaxy-galaxy lensing measurements with 1% survey and its forecast 

• [Gabe] Nguyen et al., Evidence for suppression of structure growth in the concordance cosmological model 

February 1, 2023

• [Chun-Hao] Paul et al., A first detection of neutral hydrogen intensity mapping on Mpc scales at z≈0.32 and z≈0.44 

• [Ryu] Xu, Dark matter halo mass function and density profile from mass and energy cascade 

January 25, 2023

• [Emily] Bernui et al., Solution of H0 tension with evidence of dark sector interaction from 2D BAO measurements 

January 18, 2023

• [Naim] Tanimura et al., Can decaying dark matter models be a solution to the S8 tension from the thermal Sunyaev-Zel'dovich effect? 

• [Gabe] Green & Meyers, Cosmological Implications of a Neutrino Mass Detection 

January 11, 2023

• [Chun-Hao] Pandey et al., Inferring the impact of feedback on the matter distribution using the Sunyaev Zel'dovich effect: Insights from CAMELS simulations and ACT+DES data 

December 7, 2022

• [Emily] Sharma et al., Testing Cosmology with Double Source Lensing 

• [Chun-Hao] Beltz-Mohrmann, Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions & Lingering Tension 

November 30, 2022

• [Peter] Horowitz & Melchior, Plausible Adversarial Attacks on Direct Parameter Inference Models in Astrophysics 

• [Naim] Rampf & Hahn, Renormalization group and UV completion of cosmological perturbations: Gravitational collapse as a critical phenomenon 

November 16, 2022

• [Beverly] Chaves-Montero et al., The galaxy formation origin of the lensing is low problem

• [Peter] Campos et al., An empirical approach to model selection: weak lensing and intrinsic alignments

November 9, 2022

• [Gabe] Di Valentino et al., Health checkup test of the standard cosmological model in view of recent Cosmic Microwave Background Anisotropies experiments 

November 2, 2022

• [Gabe] McCarthy & Hill, Converting dark matter to dark radiation does not solve cosmological tensions 

• [Nihar] Gnedin & Hui, Probing the Universe with the Lyman-alpha Forest: I. Hydrodynamics of the Low Density IGM 

October 26, 2022

• [Chun-Hao] Hernández-Aguayo et al., The MillenniumTNG Project: High-precision predictions for matter clustering and halo statistics 

• [Kevin] Semenaite et al., Beyond ΛCDM constraints from the full shape clustering measurements from BOSS and eBOSS 

October 19, 2022

• [Emily] Trapp et al., Lyman-alpha Emitters in Ionized Bubbles: Constraining the Environment and Ionized Fraction 

• [Chun-Hao] Storey-Fisher et al., The Aemulus Project VI: Emulation of beyond-standard galaxy clustering statistics to improve cosmological constraints 

October 12, 2022

• [Heyang] Long et al., Impact of inhomogeneous reionization on post-reionization 21 cm intensity mapping measurement of cosmological parameters 

• [Nihar] Lu et al., Constraints on Cosmological Parameters with a Sample of Type Ia Supernovae from JWST 

October 5, 2022

• [Naim] Villasenor et al., New Constraints on Warm Dark Matter from the Lyman-α Forest Power Spectrum 

• [Chun-Hao] Aung et al., The Uchuu-UniverseMachine dataset: Galaxies in and around Clusters 

September 22, 2022

• [Peter] Poulin et al., The Sigma-8 Tension is a Drag 

• [Naim] Croft et al., Weak lensing of the Lyman-alpha forest 

• [Naim] Shaw et al., Weak Lensing the non-Linear Ly-alpha Forest 

September 14, 2022

• [Chun-Hao] Garcia et al., A Better Way to Define Dark Matter Haloes 

September 7, 2022

• [Naim] Puchwein et al., The Sherwood-Relics simulations: overview and impact of patchy reionization and pressure smoothing on the intergalactic medium 

August 31, 2022

• [Gabe] Menci et al., High-Redshift Galaxies from Early JWST Observations: Constraints on Dark Energy Models 

July 20, 2022

• [Harrison] Practice Talk

Title: Dynamical perturbations of extreme mass ratio inspirals near resonances

Abstract: Extreme mass ratio inspirals (EMRIs) are systems with a compact object orbiting a much more massive (e.g., galactic center) black hole. They are of interest both as a new probe of the environments of galactic nuclei, and their waveforms are a precision test of the Kerr metric. My work focuses on expanding what Makana and Chris recently published by generalizing the outer orbit. This will help create more physically realistic models of galactic centers and the gravitational waveforms they will produce.

• [Heyang]  Barsanti et al.,  Detecting Subsolar-Mass Primordial Black Holes in Extreme Mass-Ratio Inspirals with LISA and Einstein Telescope 

July 6, 2022

• [Chun-Hao] Lucie-Smith et al.,  Insights into the origin of halo mass profiles from machine learning

• [Heyang] Jiang et al., Definitive upper bound on the negligible contribution of quasars to cosmic reionization

June 8, 2022

• [Naim] Eckert et al., Constraints on dark matter self-interaction from the internal density profiles of X-COP galaxy clusters 

• [Gabe] Pogosain et al., Future CMB constraints on cosmic birefringence and implications for fundamental physics 

June 1, 2022

• [Heyang] Trott & Huterer, Challenges for the statistical gravitational-wave method to measure the Hubble constant

• [Makana] Bronicki et al., Tidally-induced nonlinear resonances in EMRIs with an analogue model

May 18, 2022

• [Andrei] Woodfiden et al., Measurements of cosmic expansion and growth rate of structure from voids in the Sloan Digital Sky Survey between redshift 0.07 and 1.0 

• [Kevin] Barreira, Can we actually constrain fNL using the scale-dependent bias effect? 

May 4, 2022

• [Heyang] Philcox et al., Determining the Hubble Constant without the Sound Horizon: Measurements from Galaxy Surveys

• [Gabe] Mosbech and Picker, Effects of Hawking evaporation on PBH distributions

April 27, 2022

• [Naim] Xiao et al, Cosmological constraints from the density gradient weighted correlation function 

• [Beverley] Slides on lensing is low / Amon et al., Consistent lensing and clustering in a low-S8 Universe with BOSS, DES Year 3, HSC Year 1 and KiDS-1000

April 20, 2022

• [Heyang] The Fermi-LAT Collaboration,  A Gamma-ray Pulsar Timing Array Constrains the Nanohertz Gravitational Wave Background

• Makana, Practice talk

Title: Dynamical perturbations of extreme mass ratio inspirals near resonances

Abstract: Extreme mass ratio inspirals (EMRIs) - systems with a compact object orbiting a much more massive (e.g., galactic center) black hole - are of interest both as a new probe of the environments of galactic nuclei, and their waveforms are a precision test of the Kerr metric. This work focuses on the effects of an external perturbation due to a third body around an EMRI system. This perturbation will affect the orbit most significantly when the inner body crosses a resonance with the outer body, and result in a change of the conserved quantities (energy, angular momentum, and Carter constant) or equivalently of the actions, which results in a subsequent phase shift of the waveform that builds up over time. We present a general method for calculating the changes in action during a resonance crossing, valid for generic orbits in the Kerr spacetime. We show that these changes are related to the gravitational waveforms emitted by the two bodies (quantified by the amplitudes of the Weyl scalar ψ4 at the horizon and at ∞) at the frequency corresponding to the resonance. This allows us to compute changes in the action variables for each body, without directly computing the explicit metric perturbations, and therefore we can carry out the computation by calling an existing black hole perturbation theory code. We plan to use this technique for future investigations of third-body effects in EMRIs and their potential impact on waveforms for LISA.

April 13, 2022

• [Hui] Sharma and Linder, Double Source Lensing Probing High Redshift Cosmology 

• [Kevin] Green and Meyers, Cosmological Implications of a Neutrino Mass Detection 

April 6, 2022

• [Naim] Ravoux et al, First measurement of the correlation between cosmic voids and the Lyman-α forest

• [Gabe] The BICEP/Keck Collaboration et al,  The Latest Constraints on Inflationary B-modes from the BICEP/Keck Telescope

March 30, 2022

• [Makana] Kuntz, Precession resonances in hierarchical triple systems

• [Chun-Hao] Zhai et al., The Aemulus Project V: Cosmological constraint from small-scale clustering of BOSS galaxies 

March 23, 2022

• [Kevin] Yuan et al., Illustrating galaxy-halo connection in the DESI era with IllustrisTNG 

March 8, 2022

• [Anna] Amon et al., Consistent lensing and clustering in a low-S8 Universe with BOSS, DES Year 3, HSC Year 1 and KiDS-1000

March 2, 2022

• [Gabe] LIteBIRD Collaboration, Probing Cosmic Inflation with the LiteBIRD Cosmic Microwave Background Polarization Survey

February 23, 2022

• [Chenxiao] Research Update

• [Kevin] Smith et al., Hints of Early Dark Energy in Planck, SPT, and ACT data: new physics or systematics? 

February 16, 2022

• [Heyang] Bernal et al., Searching for the radiative decay of the cosmic neutrino background with line-intensity mapping

• [Chun-Hao] Lin et al., A Pair of Early- and Late-Forming Galaxy Cluster Samples: Evidence of Halo Assembly Bias?

February 9, 2022

• [Gabe] Heisenberg et al., Can late-time extensions solve the H0 and σ8 tensions? 

• [Kevin] Jakobsen et al., The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope I. Overview of the instrument and its capabilities 

February 2, 2022

• [Hui] Möller et al., The Dark Energy Survey 5-year photometrically identified Type Ia Supernovae

• [Makana] Ricciardone et al., Cross-correlating Astrophysical and Cosmological Gravitational Wave Backgrounds with the Cosmic Microwave Background

January 26, 2022

• [Jack] Fluri et al., A Full wCDM Analysis of KiDS-1000 Weak Lensing Maps using Deep Learning 

• [Kevin] Xu et al., Kinematic Lensing with the Roman Space Telescope 

January 12, 2022

• [Heyang] Munoz, A Standard Ruler at Cosmic Dawn

• [Gabriel]Auffinge, Limits on primordial black holes detectability with Isatis: A BlackHawk tool

December 15, 2021

• [Kevin] Philcox, Cosmology Without Windows: Quadratic Estimators for the Galaxy Power Spectrum 

• [Beverly] Villaescusa-Navarro et al., Multifield Cosmology with Artificial Intelligence 

November 17, 2021

• Cyril Creque-Sarbinowski (JHU)

Title: AGN Variability and HEAN in the age of VRO

Abstract: Over the next ten years, the Vera C. Rubin Observatory (VRO) will observe ∼10 million active galactic nuclei (AGN) with a regular and high cadence. During this time, the intensities of most of these AGN will vary stochastically. Moreover, these fluctuations may also be connected to the high-energy astrophysical neutrino (HEAN) flux observed by IceCube. In this talk, I explore the prospects to quantify these fluctuations with VRO-measurements of AGN light curves and also evaluate the capacity of VRO, in tandem with various current and upcoming neutrino telescopes, to establish AGN as HEAN emitters.  I find that AGN variability measurements will be so precise as to allow the AGN to be separated into up to ∼ 10 different correlation-timescale bins. I also show that if the correlation time varies as some power of the luminosity, the normalization and power-law index of that relation will be determined to O(10^{−4}%).  Finally, I find that it may be possible to detect AGN contributions at the ~ 3\sigma level to the HEAN flux even if these AGN contribute only ~10% of the HEAN flux.

November 10, 2021

• Kaili, Research Talk

Title: Studying galaxy cluster morphological metrics with Mock-X

Abstract: Dynamically relaxed galaxy clusters have long played a role in galaxy cluster studies because it is thought their properties can be reconstructed more precisely and with less systematics. As relaxed clusters are desirable, there exist a plethora of criteria for classifying a galaxy cluster as relaxed. In this work, we examine 9 commonly used observational and theoretical morphological metrics extracted from 54,000 Mock-X synthetic X-ray images of galaxy clusters taken from the IllustrisTNG, BAHAMAS and MACSIS simulation suites. We find that the simulated criteria distributions are in reasonable agreement with the observed distributions. Many criteria distributions evolve as a function of redshift, cluster mass, numerical resolution and subgrid physics, limiting the effectiveness of a single relaxation threshold value. All criteria are positively correlated with each other, however, the strength of the correlation is sensitive to redshift, mass and numerical choices. Driven by the intrinsic scatter inherent to all morphological metrics and the arbitrary nature of relaxation threshold values, we find the consistency of relaxed subsets defined by the different metrics to be relatively poor. Therefore, the use of relaxed cluster subsets introduces significant selection effects that are non-trivial to resolve.

• [Heyang] Pacucci & Loeb, The Search for the Farthest Quasar: Consequences for Black Hole Growth and Seed Models

November 3, 2021

• [Naim] Bosman et al., Hydrogen reionisation ends by 𝑧 = 5.3: Lyman-𝛼 optical depth measured by the XQR-30 sample 

• [Naim] Garny et al., Neutrino mass bounds from confronting an effective model with BOSS Lyman-α data

October 27, 2021

• [Kevin] Taylor et al., The RSD Sorting Hat: Unmixing Radial Scales in Projection 

October 20, 2021

• [Gabe] Coogan et al., Direct Detection of Hawking Radiation from Asteroid-Mass Primordial Black Holes 

October 13, 2021

• [Heyang] Strokov et al., Hunting intermediate-mass black holes with LISA binary radial velocity measurements

• [Chun-Hao] Banerjee & Abel, Nearest Neighbor distributions: new statistical measures for cosmological clustering

September 29, 2021

• Kevin, Practice Talk

Title: The DESI Focal Plane: Joys and Complication

Abstract: The Dark Energy Spectroscopic Instrument (DESI) is undertaking the largest redshift survey in existence. In the next few years, DESI will collect the redshifts of as many as 35 million galaxies. No small part of this incredible achievement is due to DESI's robotic focal plane system. In this talk I will give a brief overview of DESI and its science goals. I will go in depth on the focal plane and some of its technical achievements. I will then talk about some of the challenges and solutions to those challenges, the focal plane introduces in clustering analysis. This will include some classic complications DESI shares with older surveys such as eBOSS as well as newer complications due to the robotic nature of DESI's focal plane.

September 22, 2021

• [Jack] Fortuna et al., KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies 

• [Kevin] Sefusatti et al., Cosmology and the Bispectrum 

September 15, 2021

• [Heyang] Review of Cosmolunch 2020-2021, slides

• [Makana] Feng  et al.,  Dynamical Instability of Collapsed Dark Matter Halos

• [Chun-Hao] Troster et al. , Joint constraints on cosmology and the impact of baryon feedback: combining KiDS-1000 lensing with the thermal Sunyaev-Zeldovich effect from Planck and ACT

September 8, 2021

• [Kevin] Sánchez  et al., Evolution mapping: a new approach to describe matter clustering in the non-linear regime 

• [Gabe] Rashkovetsky et al., Small-scale Clumping at Recombination and the Hubble Tension 

September 1, 2021

• [Kevin] Chaussidon et al., Angular clustering properties of the DESI QSO target selection using DR9 Legacy Imaging Surveys 

• [Hui] Portillo et al., Photometric Biases in Modern Surveys 

August 25, 2021

• [Ami] Fang et al., Cosmology from Clustering, Cosmic Shear, CMB Lensing, and Cross Correlations: Combining Rubin Observatory and Simons Observatory 

August 18, 2021

• [Heyang] Bayer et al., Beware of Fake νs: The Effect of Massive Neutrinos on the Non-Linear Evolution of Cosmic Structure 

• [Makana] Philcox et al., A First Detection of the Connected 4-Point Correlation Function of Galaxies Using the BOSS CMASS Sample 

August 4, 2021

• [Lauren] Valentino et al., On the most constraining cosmological neutrino mass bounds 

• [Kevin] Krolewski et al., Cosmological constraints from unWISE and Planck CMB lensing tomography 

July 14, 2021

• [Kevin] Nunes and Vagnozzi, Arbitrating the S8 discrepancy with growth rate measurements from Redshift-Space Distortions 

June 30, 2021

• [Heyang] Breysse et al., Mapping the Universe in HD 

• [Kevin] Bianchi and Verde, Confronting missing observations with probability weights: Fourier space and generalised formalism

June 23, 2021

• [Gabe] Chae et al., Testing the Strong Equivalence Principle: Detection of the External Field Effect in Rotationally Supported Galaxies 

June 2, 2021

• [Kevin] Ross et al., The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Large-scale Structure Catalogs for Cosmological Analysis 

• [Gabe] Chudaykin et al., Exploring Early Dark Energy solution to the Hubble tension with Planck and SPTPol data 

May 26, 2021

• [Lauren] Shen et al., A hidden population of high-redshift double quasars unveiled by astrometry 

• [Makana] Safarzadeh and Ramirez-Ruiz, EXPLAINING THE LIGO BLACK HOLE MASS FUNCTION WITH FIELD BINARIES: REVISITING STELLAR EVOLUTION AT LOW METALLICITY OR INVOKING GROWTH VIA GAS ACCRETION? 

May 12, 2021

• [Jahmour] Singh, improved Master for the LSS: Fast and accurate analysis of the two point power spectra and correlation functions 

• [Kevin] Castello et al., An updated dark energy view of inflation 

April 28, 2021

• [Anna] Euclid Collaboration, Euclid preparation: XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses 

• [Kevin] Malz et al., An information-based metric for observing strategy optimization, demonstrated in the context of photometric redshifts with applications to cosmology 

April 21, 2021

• [Kevin] Li et al., Hubble diagram at higher redshifts: Model independent calibration of quasars 

• [Gabe] Ali-Haimoud, Testing dark matter interactions with CMB spectral distortions 

April 14, 2021

• [Jack] Andrade-Oliveira et al., Galaxy Clustering in Harmonic Space from the Dark Energy Survey Year 1 Data: Compatibility with Real-Space Results 

April 7, 2021

• [Lauren] Cuceu et al., Cosmology beyond BAO from the 3D distribution of the Lyman-𝛼 forest 

• [Kevin] Efstathiou, To H0 or not to H0? 

March 24, 2021

• [Yi-Kuan] Schaan and White, Astrophysics & Cosmology from Line Intensity Mapping vs Galaxy Surveys 

• [Kevin] Hadzhiyska et al., Hefty enhancement of cosmological constraints from the DES Y1 data using a Hybrid Effective Field Theory approach to galaxy bias 

March 17, 2021

• [Jahmour] McCarthy et al., Baryonic feedback biases on fundamental physics from lensed CMB power spectra 

• [Lauren] Rogers and Peiris, Strong bound on canonical ultra-light axion dark matter from the Lyman-alpha forest 

March 10, 2021

• [Heyang] Xu et al., Maximum Absorption of the Global 21 cm Spectrum in the Standard Cosmological Model 

• [Hui] Reiman and Gohre, Deblending galaxy superpositions with branched generative adversarial networks 

March 3, 2021

• [Gabe] Bernal et al., The trouble beyond H0 and the new cosmic triangles 

• [Kevin] Alsing and Handley, Nested sampling with any prior you like 

February 24, 2021

• Yi-Kuan, Practice talk

Title:

Probing the Cosmic Inventory by Unlocking the Diffuse Light in Sky Surveys

Abstract:

The formation of stars, galaxies, and the large-scale structure in the Universe drives complex energy density flows over a wide range of scales from atomic nuclei to the Hubble length. The net effect could be summarized by a census of the density parameters, Ω, for different entries in the cosmic inventory over time. I will present my ongoing effort to probe the history of several key cosmic constituents, including stars, dust, thermal, and gravitational energy associated with the large-scale structure. To do so, we deproject the cosmic UV, IR, and the Sunyaev-Zeldovich effect backgrounds over redshift using a new tomographic intensity mapping approach. While the results are already pushing our understanding of the Universe, they represent only the beginning of a new chapter of cosmology and astrophysics using the entire radiation field without necessarily resolving individual galaxies. Looking forward, I will describe the infrastructure that we are building in facilitating a close synergy between galaxy surveys and intensity mapping. I will close by highlighting some exciting science opportunities in the next decade.

February 17, 2021

• Paul: Career Advice Talk Part 2 of 2

February 10, 2021

• [Kevin] Yuan et al., Evidence for galaxy assembly bias in BOSS CMASS redshift-space galaxy correlation function 

• Paul: Career Advice Talk Part 1 of 2

February 3, 2021

• Naim Karacayli (Yale), Follow-up to CCAPP Seminar "From 100 Mpc to 1 Mpc with 1D Lyman-alpha Power Spectrum"

• [Kevin] Malz, How not to obtain the redshift distribution from probabilistic redshift estimates: Under what conditions is it not inappropriate to estimate the redshift distribution N(z) by stacking photo-z PDFs? 

January 27, 2021

• [Paul] Blakeslee et al., The Hubble Constant from Infrared Surface Brightness Fluctuation Distances 

• Tansu Daylan (MIT), Follow-up to CCAPP Seminar "Discovery of the HD 108236 multiplanetary system with a bright Sun-like star"

January 20, 2021

• Linda Xu (Harvard), Follow-up to CCAPP Seminar "Cosmological Measurements of Massive Light Relics"

• Dustin Madison (West Virginia), Follow-up to CCAPP Seminar "Gravitational Wave Memory and the Cosmic Microwave Background"

January 13, 2021

• [Anna] Cawthon et al., Dark Energy Survey Year 3 Results: Calibration of Lens Sample Redshift Distributions using Clustering Redshifts with BOSS/eBOSS 

• [Ami and Jack] Dark Energy Survey Year 3 Results: Measuring the Survey Transfer Function with Balrog 

December 16, 2020

• [Hui] Azzoni et al., A minimal power-spectrum-based moment expansion for CMB B-mode searches 

• Jahmour and Lauren: Reflection on DESI Collaboration meeting

December 9, 2020

• Johannes Lange (UCSC): An All-Scale Cosmological Analysis of Anisotropic Clustering in BOSS LOWZ

• [Heyang] Gazagnes et al., Inferring the properties of the sources of reionization using the morphological spectra of the ionized regions 

Abstract:

I will present new constraints on the growth rate parameter $f \sigma_8$ from modeling the anisotropic clustering in BOSS LOWZ. Compared to previous analyses, we extend the modeling into the highly non-linear regime down to scales $s \sim 0.5 \, \mathrm{Mpc} / h$. Extracting cosmological information from non-linear scales is made possible via a sophisticated, simulation-based modeling approach. We directly compare observational data against dark matter-only simulations populated via a Halo Occupation Distribution (HOD) framework. I will discuss the HOD model used, including the effects of observational incompleteness, galaxy assembly bias and galaxy velocity bias. I will also discuss tests on mock catalogs to ensure that our cosmological constraints are unbiased. Finally, I will present cosmological constraints from applying this analysis framework to two samples of $~70,000$ galaxies at redshifts $z \approx 0.25$ and $z \approx 0.40$. The derived cosmological constraints on $f \sigma_8$ are more stringent than any previous study targeting large linear scales only.

December 2, 2020

• [Kevin] Kim et al., Giving Cosmic Redshift Drift a Whirl 

• Beverly: Research Update: DMASS overview

November 18, 2020

• [Lauren]  Yang et al., Measurements of the z ∼6 Intergalactic Medium Optical Depth and Transmission Spikes Using a New z > 6.3 Quasar Sample

• Makana: Research update

November 4, 2020

• Gabe: Mental Health in Academia

October 28, 2020

• [Kevin] Hang et al., Galaxy clustering in the DESI Legacy Survey and its imprint on the CMB 

October 21, 2020

• Yun-Ting Cheng (Caltech), follow-up to CCAPP seminar "Cosmology and Astrophysics with Intensity Mapping"

• [Yi-Kuan] Rhodes et al., The End of Galaxy Surveys 

October 14, 2020

• [Kevin] Zu, On the “Lensing is Low” of BOSS Galaxies 

• [Gabe] Jedamzik et al., Why reducing the cosmic sound horizon alone can not fully resolve the Hubble tension 

October 7, 2020

• [Hui] He et al., Learning to Predict the Cosmological Structure Formation 

• [Anna] Miranda et al., Interpreting Internal Consistency of DES Measurements 

September 30, 2020

• Lauren: Research update: Masking BAL quasars in Ly-α forest

• [Heyang] Zhou et al., A Model-independent Indicator for the Speed of Cosmic Reionization 

September 23, 2020

• [Ami] Mead et al., HMcode-2020: Improved modelling of non-linear cosmological power spectra with baryonic feedback 

• [Heyang] Zhou et al., Robust Intensity Mapping Analysis against Foregrounds for the Epoch of Reionization 

September 16, 2020

• [Kevin] Tramonte and Ma, The neutral hydrogen distribution in large-scale haloes from 21-cm intensity maps 

• [Chenxiao] Meneghetti et al., An excess of small-scale gravitational lenses observed in galaxy clusters 

September 9, 2020

• [Gabe]

August 19, 2020

• • Heymans et al., KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints

August 5, 2020

• • Blot et al., Cosmological Model Parameter Dependence of the Matter Power Spectrum Covariance from the DEUS-PUR Cosmo Simulations

• KiDS-1000 Cosmology papers

July 22, 2020

• Final eBOSS data release and cosmology analysis

• Aiola et al., The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters

July 8, 2020

• • Akitsu et al., Imprint of anisotropic primordial non-Gaussianity on halo intrinsic alignments in simulations

July 1, 2020

• • Chiang et al., The Cosmic Thermal History Probed by Sunyaev-Zeldovich Effect Tomography

• Ivanov et al., Constraining Early Dark Energy with Large-Scale Structure

June 17, 2020

• • Pagano and Liu, Quantifying Density-Ionization Correlations with the 21cm Power Spectrum

May 27, 2020

• • Ivanov et al., H0 tension or T0 tension?

  • Cain et al., A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization

May 6, 2020

• • Ata et al., BIRTH of the COSMOS Field: Primordial and Evolved Density Reconstructions During Cosmic High Noon

• Hortua et al., Parameters Estimation from the 21 cm signal using Variational Inference

April 29, 2020

• • Jelic-Cizmek et al., On the importance of lensing for galaxy clustering in photometric and spectroscopic surveys

April 22, 2020

• Asgari et al., Minimising the impact of scale-dependent galaxy bias on the joint cosmological analysis of large scale structure

• Jedamzik and Pogosian, Relieving the Hubble tension with primordial magnetic fields

April 15, 2020

• • Fang et al., 2D-FFTLog: Efficient computation of real space covariance matrices for galaxy clustering and weak lensing

• Eifler et al., Cosmology with the Wide-Field Infrared Survey Telescope -- Synergies with the Rubin Observatory Legacy Survey of Space and Time

• Eifler et al., Cosmology with the Wide-Field Infrared Survey Telescope -- Multi-Probe Strategies

April 8, 2020

• • Ravoux et al., A tomographic map of the large-scale matter distribution using the eBOSS Stripe 82 Ly-α forest

• Shuntov et al., PhotoWeb redshift: boosting photometric redshift accuracy with large spectroscopic surveys

April 1, 2020

• • Kusakabe et al., The MUSE Hubble Ultra Deep Field Survey XIV. The evolution of the Lya emitter fraction from z=3 to z=6

• Tessore and Harrison, Source Distributions of Cosmic Shear Surveys in Efficiency Space

March 25, 2020

• • Bauer et al., Intensity Mapping as a Probe of Axion Dark Matter

• Sanchez, Let us bury the prehistoric h: arguments against using h−1Mpc units in observational cosmology

March 18, 2020

• • Givans & Hirata, Redshift-space streaming velocity effects on the Lyman-α forest baryon acoustic oscillation scale

• Rose et al., No Evidence for Type Ia Supernova Luminosity Evolution: Evidence for Dark Energy is Robust

• Wilczynska et al., Four direct measurements of the fine-structure constant 13 billion years ago

February 26, 2020

• • Yao et al., Unveiling the Intrinsic Alignment of Galaxies with Self-Calibration and DECaLS DR3 data

• Newman et al., LATIS: The Lyα Tomography IMACS Survey

February 12, 2020

• • Cang et al., Probing Dark Matter with Future CMB Measurements

February 5, 2020

• • Arjona and Nesseris, Hints of dark energy anisotropic stress using Machine Learning

• Ashtekar et al., Alleviating the tension in CMB using Planck-scale Physics

• Kang et al., Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for Luminosity Evolution in Supernova Cosmology

January 29, 2020

• • Nicola et al., Tomographic galaxy clustering with the Subaru Hyper Suprime-Cam first year public data release

• Askar et al., Finding black holes with black boxes - using machine learning to identify globular clusters with black hole subsystems

January 22, 2020

• • Beradze and Gogberashvili, Can the quasi-molecular mechanism of recombination decrease the Hubble tension?

• Taruya and Okumura, Improving geometric and dynamical constraints on cosmology with intrinsic alignments of galaxies

January 15, 2020

• • Contigiani, Lensing efficiency for gravitational wave mergers

December 4, 2019

• • Velten and Gomes, Is the Hubble diagram of quasars in tension with concordance cosmology?

November 20, 2019

• • Oklopčić et al., Detecting Magnetic Fields in Exoplanets with Spectropolarimetry of the Helium Line at 1083 nm

• Rameez and Sarkar, Is there really a `Hubble tension'?

• Hikage et al., Perturbation theory for the redshift-space matter power spectra after reconstruction

November 6, 2019

• • Dai and Xia, Constraints on running of non-Gaussianity from large scale structure probes

  • Herbonnet et al., Ellipticity of Brightest Cluster Galaxies as tracer of halo orientation and weak-lensing mass bias

October 23, 2019

• • Sellentin, A blinding solution for inference from astronomical data

• Chiang and Menard, Extragalactic Imprints in Galactic Dust Maps

October 16, 2019

• • Asgari et al., KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs

• Lin et al., The Impact of Light Polarization Effects on Weak Lensing Systematics

October 9, 2019

• Nobel Prize in Physics 2019

October 2, 2019

• • Tröster et al., Cosmology from large-scale structure: Constraining ΛCDM with BOSS

September 25, 2019

Xiao Fang: https://docs.google.com/presentation/d/1IT3nkyy93wSn4eHrr17ylK-8SVFvJBhMVexZ3dLGlb0/edit?usp=sharing

September 18, 2019

• Rudakovskyi et al., Can EDGES observation favour any dark matter model?

• Bianchi et al., Unbiased clustering estimates with the DESI fibre assignment

September 11, 2019

• Capparelli et al., Cosmic Birefringence Test of the Hubble Tension

September 4, 2019

• • Mitsou & Yoo, Tetrad formalism for exact cosmological observables

• Beltz-Mohrmann et al., Testing the Accuracy of Halo Occupation Distribution Modelling using Hydrodynamic Simulations

August 13, 2019

• Endo et al., First light demonstration of the integrated superconducting spectrometer

• Di Valentino et al., Interacting dark energy after the latest Planck, DES, and H0 measurements: an excellent solution to the H0 and cosmic shear tensions

August 6, 2019

• • Di Valentino et. al., Cosmological constraints in extended parameter space from the Planck 2018 Legacy release

July 3, 2019

• Joudaki et al., KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

• Hamana et al., Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data

June 26, 2019

• • Gelmini et al., Hints of Sterile Neutrinos in Recent Measurements of the Hubble Parameter

June 19, 2019

• • Bengochea et al., Can the quantum vacuum fluctuations really solve the cosmological constant problem?

• Pritchard and Loeb, Evolution of the 21 cm signal throughout cosmic history

June 5, 2019

• • Lee et al., Producing a BOSS CMASS sample with DES imaging

  • Kadota et al., The cross-correlation between 21cm and CMB B modes from the cosmic birefringence in existence of light scalar field

May 29, 2019

• • Keeley et al., Implications of a transition in the dark energy equation of state for the H0 and σ8 tensions

• Katz et al., How to Quench a Dwarf Galaxy: The Impact of Inhomogeneous Reionization on Dwarf Galaxies and Cosmic Filaments

May 1, 2019

• • Digman et al., Forecasting Super-Sample Covariance in Future Weak Lensing Surveys with SuperSCRAM

• Pandey et al., Constraints on the redshift evolution of astrophysical feedback with Sunyaev-Zeldovich effect cross-correlations

April 24, 2019

• • Park et al., Alcock-Paczynski Test with the Evolution of Redshift-space Galaxy Clustering Anisotropy

• DESI Comissioning

April 17, 2019

• • Kitching et al., Propagating Residual Biases in Cosmic Shear Power Spectra

April 10, 2019

• • Van Dokkum et al., A second galaxy missing dark matter in the NGC1052 group

  • Zagorac et al., GUT-Scale Primordial Black Holes: Mergers and Gravitational Waves

April 3  2019

• • Astro2020 White Paper Week continued

  • Seminar Speaker

  • Alvarez et al., Mapping Cosmic Dawn and Reionization: Challenges and Synergies

  • Ferraro et al., Inflation and Dark Energy from spectroscopy at z>2

March 27  2019

• • Astro2020 White Paper Week

  • Caldwell et al., Cosmology with a Space-Based Gravitational Wave Observatory

  • Alvarez et al., Mapping Cosmic Dawn and Reionization: Challenges and Synergies

  • Berti et al., Tests of General Relativity and Fundamental Physics with Space-based Gravitational Wave Detectors

  • Ferraro et al., Inflation and Dark Energy from spectroscopy at z>2

  • Zagorac et al., GUT-Scale Primordial Black Holes: Mergers and Gravitational Waves

March 6  2019

• • Garcia-Farieta et al., Clustering and redshift-space distortions in modified gravity models with massive neutrinos

  • Cromer et al., Improving Constraints on Fundamental Physics Parameters with the Clustering of Sunyaev-Zeldovich Selected Galaxy Clusters

  • Madhavacheril et al.,  Fundamental Physics from Future Weak-Lensing Calibrated Sunyaev-Zel'dovich Galaxy Cluster Counts

  • Cosmo-lunch poll

February 27  2019

• • Montero-Camacho et al., Impact of inhomogeneous reionization on the Lyman-α forest

  • Castorina et al., Measuring the growth of structure with intensity mapping surveys

February 19  2019

• • All about mocks. Special event: discussion led by Albert Chuang (Stanford) and Ashley: Chuang et al., nIFTy Cosmology: Galaxy/halo mock catalogue comparison project on clustering statistics, Blot et al., Comparing approximate methods for mock catalogues and covariance matrices II: Power spectrum multipoles, Colavincenzo et al., Comparing approximate methods for mock catalogues and covariance matrices III: Bispectrum  and Lippich et al., Comparing approximate methods for mock catalogues and covariance matrices I: correlation function

  • Montero-Camacho et al., Impact of inhomogeneous reionization on the Lyman-α forest

February 13  2019

• • Kreisch et al., The Neutrino Puzzle: Anomalies, Interactions, and Cosmological Tensions

  • Ligo & Virgo Collaborations, Search for transient gravitational wave signals associated with magnetar bursts during Advanced LIGO's second observing run

February 6  2019 

• • Kim et al., Dust Polarization Maps from TIGRESS: E/B power asymmetry and TE correlation

  • Zheng et al., A Model-Independent Measurement of the Spatial Curvature using Cosmic Chronometers and the HII Hubble Diagram

January 29  2019 -> canceled due to polar vortex

• • Kim et al., Dust Polarization Maps from TIGRESS: E/B power asymmetry and TE correlation

January 23  2019 

• • Practice talk by Heidi Wu on Probing Cosmic Acceleration with Galaxy Clusters

Abstract:

The acceleration of the Universe is one of the biggest puzzles in physics: is it due to a cosmological constant, dynamical dark energy, or modification of gravity?  Galaxy clusters provide a unique opportunity to answer this question.  In this talk, I will first introduce how we use large sky surveys of galaxy clusters to study cosmic acceleration.  In these surveys, a major challenge is to accurately infer the mass of clusters.  I will then present my research on using simulations to improve mass calibration methods — including galaxy dynamics, weak gravitational lensing, and X-ray observations.  These results not only mitigate the systematic errors in current cluster surveys but also help the optimization of future ground- and space-based missions.

January 16  2019

• • Zeng et al., Searching for Oscillations in the Primordial Power Spectrum with CMB and LSS Data

  • Broadhurst et al., Twin LIGO/Virgo Detections of a Viable Gravitationally-Lensed Black Hole Merger

  • Hannuksela et al., Search for gravitational lensing signatures in LIGO-Virgo binary black hole events

December 11,  2018

• • LIGO & Virgo collaborations, GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs

  • Chabanier et al., The one-dimensional power spectrum from the SDSS DR14 Lyα forests

November 28,  2018 (special time -> 2:00 pm)

• • Xu et al., Finding cosmic voids and filament loops using topological data analysis

  • Johnston et al., KiDS+GAMA: Intrinsic alignment model constraints for current and future weak lensing cosmology

November 14,  2018

• • Talk by Dustin Madison on Clocks in Space! Efforts to Detect Gravitational Waves Through Pulsar Timing

Abstract:

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) is well into a second decade of precisely timing an array of millisecond pulsars with the intent to detect and characterize gravitational waves (GWs) generated by, among other things, inspiraling supermassive black hole binaries (SMBHBs). I will discuss various aspects of the astrophysics of nanohertz gravitational waves, from the coupling of SMBHBs to their environments to cosmic superstrings to non-Einsteinian GW polarizations. I will also discuss how the anticipated features of the nanohertz GW landscape and the astrophysics of pulsars and the interstellar medium inform NANOGrav’s observing strategies

October 31,  2018

• • Talk by Johannes Lange on Updated Results on the Galaxy-Halo Connection from Satellite Kinematics in SDSS

Abstract:

I will present new results on the relationship between central galaxies and dark matter halos inferred from observations of satellite kinematics in the Sloan Digital Sky Survey (SDSS) DR7. We employ an updated analysis framework that includes detailed mock catalogues to model observational effects in SDSS. Our results constrain the color-dependent conditional luminosity function (CLF) of dark matter halos, as well as the radial profile of satellite galaxies. Confirming previous results, we find that red central galaxies live in more massive halos than blue galaxies at fixed luminosity. Additionally, our results suggest that satellite galaxies have a radial profile less centrally concentrated than dark matter but not as cored as resolved subhalos in dark matter-only simulations. Compared to previous works using satellite kinematics by More et al. (2011), we find much more competitive constraints on the galaxy-halo connection, on par with those derived from a combination of galaxy clustering and galaxy-galaxy lensing. I will also compare our results on the galaxy-halo connection to other studies using galaxy clustering, galaxy-galaxy lensing and group catalogues, showing very good agreement between these different techniques. This resolves the tension between satellite kinematics results, as previously reported by More et al. (2011), and other probes.

October 24,  2018 

• • Bonilla et al., Forecast on lepton asymmetry from future CMB experiments

  • Talk by Jesse Golden-Marx on The Impact of Environment on Late Time Evolution of the Stellar Mass-Halo Mass relation

Abstract:

The Stellar Mass-Halo Mass (SMHM) relation provides insight into the galaxy-dark matter halo connection.  In Golden-Marx & Miller (2018), we incorporate the magnitude gap, the difference in brightness between the BCG and 4th brightest cluster member within 0.5 R200, into the cluster SMHM relation.  We observe that at fixed halo mass, clusters with larger magnitude gaps have larger central galaxy stellar masses.  We also see this in semi-analytic simulations, which suggests that it can be explained by the hierarchical growth of central galaxies.  Accounting for the magnitude gap significantly reduces the inferred intrinsic scatter to below 0.1 dex, thus strictly limiting the model space that can explain the stellar mass growth in centrals of massive halos.  Hierarchical growth also predicts that the central’s stellar mass and magnitude gap decrease with increasing lookback time.  However, the extent of the growth of the central’s stellar mass is dependent upon the aperture defined by the radial extent of the central galaxy.  We investigate the impact of aperture size on the slope of the SMHM relation and find that the slope is significantly steeper at larger aperture radii (~100 kpc).  Using this result, we test the prediction of hierarchical growth, and present our latest results using SDSS-redMaPPer.  Unlike prior studies we detect redshift evolution in the slope of the SMHM relation (measured at 100kpc aperture), which can be explained by recent merger activity. 

October 10,  2018 

• • Shanks et al., GAIA Cepheid parallaxes and 'Local Hole' relieve H0 tension

  • If needed: Riess et al., Seven Problems with the Claims Related to the Hubble Tension in arXiv:1810.02595

  • DES collaboration, Dark Energy Survey Year 1 Results: Constraints on Extended Cosmological Models from Galaxy Clustering and Weak Lensing

October 3,  2018 

• • Hikage et al., Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data

  • Kozmanyan et al., Derivation of the Hubble constant using Planck and XMM-Newton observations of galaxy clusters

September 25,  2018 

• • Gould, Femtolensing of Gamma Ray Bursters

  • Ross et al., The Commissioning Instrument for the Dark Energy Spectroscopic Instrument

  • Kozmanyan et al., Derivation of the Hubble constant using Planck and XMM-Newton observations of galaxy clusters

September 19,  2018 

• • Klypin et al., Effects of long-wavelength fluctuations in large galaxy surveys

  • Wang et al., Evolution of dark energy reconstructed from the latest observations

  • Huang et al., Modeling baryonic physics in future weak lensing surveys

September 12,  2018 

• • Hemmatl et al., Photometric redshift calibration requirements for WFIRST Weak Lensing Cosmology: Predictions from CANDELS

  • Kable et al., Quantifying the CMB Degeneracy Between the Matter Density and Hubble Constant in Current Experiments

  • Klypin et al., Effects of long-wavelength fluctuations in large galaxy surveys

  • Huang et al., Modeling baryonic physics in future weak lensing surveys

September 6,  2018 

• • Springer et al., Weak lensing shear estimation beyond the shape-noise limit: a machine learning approach

  • Matt & Jahmour will talk to us about interesting topics from COSMO-18

August 23,  2018 

• • O'Connel et al., Large Covariance Matrices: Accurate Models Without Mocks

  • Mukherjee et al., Beyond the classical distance-redshift test: cross-correlating redshift-free standard candles and sirens with redshift surveys

August 16,  2018

• • Hall & Taylor, A Bayesian method for combining theoretical and simulated covariance matrices for large-scale structure surveys

  • Sanchez & Bernstein, Redshift inference from the combination of galaxy colors and clustering in a hierarchical Bayesian model

  • Walther et al., New Constraints on IGM Thermal Evolution from the Lyα Forest Power Spectrum

  • Katz et al., Femtolensing by Dark Matter Revisited

July 19,  2018

• • Planck 18 results: Akrami et al., Planck 2018 results. I. Overview and the cosmological legacy of Planck

  • Aghanim et al., Planck 2018 results. VI. Cosmological parameters

  • Aghanim et al., Planck 2018 results. VIII. Gravitational lensing

  • Akrami et al., Planck 2018 results. X. Constraints on inflation

  • Talk by Denise Schmitz on Time evolution of intrinsic alignments of galaxies

Abstract:

Intrinsic alignments (IA), correlations between the intrinsic shapes and orientations of galaxies on the sky, are both a significant systematic in weak lensing and a probe of the effect of large-scale structure on galactic structure and angular momentum. In the era of precision cosmology, it is thus especially important to model IA with high accuracy. Efforts to use cosmological perturbation theory to model the dependence of IA on the large-scale structure have thus far been relatively successful; however, extant models do not consistently account for time evolution. In particular, advection of galaxies due to peculiar velocities alters the impact of IA, because galaxy positions when observed are generally different from their positions at the epoch when IA is believed to be set. In this work, we evolve the galaxy IA from the time of galaxy formation to the time at which they are observed, including the effects of this advection, and show how this process naturally leads to a dependence of IA on the velocity shear. We calculate the galaxy-galaxy-IA bispectrum to tree level (in the linear matter density) in terms of the evolved IA coefficients. We then discuss the implications for weak lensing systematics as well as for studies of galaxy formation and evolution. We find that considering advection introduces nonlocality into the bispectrum, and that the degree of nonlocality represents the memory of a galaxy's path from the time of its formation to the time of observation. We discuss how this result can be used to constrain the redshift at which IA is determined and provide Fisher estimation for the relevant measurements using the example of SDSS-BOSS.

July 5,  2018 

• • Leistedt et al., Hierarchical modeling and statistical calibration for photometric redshifts

  • Talk by prof. Braaten on Production of dark-matter bound states in the early universe by three-body recombination

Abstract:

The small-scale structure problems of the universe can be solved by self-interacting dark matter that becomes strongly interacting at low energy. A particularly predictive model for the self-interactions is resonant short-range interactions with an S-wave scattering length that is much larger than the range. The velocity dependence of the cross section in such a model provides an excellent fit to selfinteraction cross sections inferred from dark-matter halos of galaxies and clusters of galaxies if the dark-matter mass is about 19 GeV and the scattering length is about 17 fm. Such a model makes definite predictions for the few-body physics of weakly bound clusters of the dark-matter particles. The formation of the two-body bound cluster is a bottleneck for the formation of larger bound clusters. We calculate the production of two-body bound clusters by three-body recombination in the early universe under the assumption that the dark matter particles are identical bosons, which is the most favorable case. If the dark-matter mass is 19 GeV and the scattering length is 17 fm, the fraction of dark matter in the form of two-body bound clusters can increase by as much as 4 orders of magnitude when the dark-matter temperature falls below the binding energy, but its present value remains less than 10−6 . The present fraction can be increased to as large as 10−3 by relaxing the constraints from small-scale structure and decreasing the mass of the dark matter particle. 

June 28,  2018

• • Mooley et al.,  Superluminal motion of a relativistic jet in the neutron star merger GW17081

  • Hotokezaka et al., A Hubble constant measurement from superluminal motion of the jet in GW170817

June 14,  2018

• • Adhikari et al., Splashback in galaxy clusters as a probe of cosmic expansion and gravity. 

  • Adhikari et al., Splashback in accreting dark matter halos

  • Beane et al., Extracting bias using the cross-bispectrum: An EOR and 21 cm-[CII]-[CII] case study

  • Chiba et al., Reconstructing f(R) gravity from the spectral index

June 5,  2018

• • Visitor talk: Alice Pisani, Title: Constraining Cosmology with Cosmic Voids

Abstract:

Cosmic voids, the emptiest regions in the Universe, are an increasingly active sector of galaxy clustering analysis. In this talk I will explain why voids are interesting tools for cosmology and what kind of void-related observables we can focus on. I will discuss the treatment of systematics and present some recent methods and results. Finally I will discuss what we can expect from current and upcoming surveys in term of constraining power.

May 24,  2018

• • Ferte et al., Testing gravity on cosmological scales with cosmic shear, cosmic microwave background anisotropies, and redshift-space distortions

  • Bianchi et al., Unbiased clustering estimates with the DESI fibre assignment

  • Tanvir et al., The fraction of ionizing radiation from massive stars that escapes to the intergalactic medium

May 10,  2018

• • Modi et al., Cosmological Reconstruction From Galaxy Light: Neural Network Based Light-Matter Connection

  • Visitor talk: Alex Alarcon, Title:  PAU Survey: Overview and current photo-z results

Abstract:

In this talk I will give an overview of the Physics of the Accelerating Universe Survey (PAUS): a unique combination of a large field-of-view and 40 narrow-band (NB) filters (12.5nm FWHM) that span the wavelength range from 450nm to 850nm and that was commissioned successfully in June 2015 on the WHT. This exquisite wavelength sampling results in photometric redshifts with a precision that approaches that of spectroscopic measurements, while being able to cover large areas of sky. I will present the current photometric redshift performance comparing to the zCOSMOS spectroscopic sample and the new photo-z template-based code that we have developed to estimate photometric redshifts for a narrow band photometric survey.

May 3,  2018

• • Castorina et al., Primordial non-Gaussianities and zero bias tracers of the Large Scale Structure

  • Riess et al., Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant

April 26,  2018

• • Jenna will talk about her research.

  • Feng et al., Exploring the posterior surface of the large scale structure reconstruction

April 19,  2018

• • Xiao might talk about constraints on sub-lunar mass range for primordial black holes if time permits it.

  • Visitor talk, Sten Delos: Constraining the primordial power spectrum using minihalos

    Abstract: Ultracompact minihalos (UCMHs) have attracted considerable interest as a probe of the primordial power spectrum at small scales.  However, previous treatments assumed that halos collapsing at early times possess an extremely steep r^-9/4 density profile.  We recently found that UCMHs actually develop shallower r^-3/2 or r^-1 inner profiles depending on the shape of the power spectrum, but these halos are still highly concentrated due to their early formation.  I will discuss these results and the factors that set the inner density profile of a dark matter halo.  I will also outline the process of deriving power spectrum constraints in this revised picture.  Since the formalism can now include halos that collapse at any time, our preliminary revised constraints turn out to be stronger than prior constraints from UCMHs.

April 5,  2018

• • Visitor talk, Lucas Seco: Probing Dark Matter Self-Interactions with Disk Galaxies

    Abstract: Self-interacting Dark Matter (SIDM) has been proposed as a way to help reconcile small scale astrophysical observations with CDM predictions. We use N-body simulations to study the effect of SIDM on the morphology of disk galaxies falling into galaxy clusters. An effective drag force arises from dark matter scatterings and leads to offsets of the stellar disk with respect to its surrounding halo, causing distortions in the disk. We show that potentially observable warps, asymmetries, and thickening of the disk occur in simulations with currently allowed cross-sections. With further analysis of the potential systematic uncertainties of these novel probes, we believe it could be possible to constrain SIDM cross-sections with current and future observations.

March 29,  2018

• • Hektor et al., Constraining Primordial Black Holes with the EDGES 21-cm Absorption Signal

  • MacCrann et al.,  DES Y1 Results: Validating cosmological parameter estimation using simulated Dark Energy Surveys

  • Baumann et al., First Measurement of Neutrinos in the BAO Spectrum

  • Xiao will talk about constraints on sub-lunar mass range for primordial black holes.

March 22,  2018

• • Montero-Camacho et al., Exploring circular polarization in the CMB due to conventional sources of cosmic birefringence

March 15,  2018

• • Montero-Camacho et al., Exploring circular polarization in the CMB due to conventional sources of cosmic birefringence

• Mehdi Rezaie talk: Mitigating Systematic Errors in Galaxy Surveys with Artificial Intelligence.

                Abstract: A robust measurement of galaxy clustering relies on our understanding of imaging systematics such as Galactic Extinction, and how they introduce fluctuations in galaxy density. In this talk we will present the idea of using Artificial Neural Networks in modeling the dependence of galaxy density on imaging systematics. This method could be used for systematic mitigation and therefore is beneficial to ongoing and future galaxy surveys such as eBOSS and DESI.

March 8,  2018

• • Zhao et al., Improving baryon acoustic oscillation measurement with the combination of cosmic voids and galaxies

  • Wheeler et al., The radial acceleration relation is a natural consequence of the baryonic Tully-Fisher relation

  • Shirasaki and Takada, Stacked lensing estimators and their covariance matrices: Excess surface mass density vs. Lensing shear

  • Leonard and Mandelbaum, Measuring the scale-dependence of intrinsic alignments using multiple shear estimates

March 1,  2018

• • Giusarma et al., Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses

  • Armano et al., Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20μHz

  • Bowman et al., An absorption profile centred at 78 megahertz in the sky-averaged spectrum

  • Barkana, Possible interaction between baryons and dark-matter particles revealed by the first stars

February 22,  2018

• • Nissanke et al., Prospects for resolving the Hubble constant tension with standard sirens

  • Pardo et al., Limits on the number of spacetime dimensions from GW170817

  • Poidevin et al., The QUIJOTE experiment: prospects for CMB B-mode polarization detection and foreground characterization

  • Martens et al., A Radial Measurement of the Galaxy Tidal Alignment Magnitude with BOSS Data

  • Dawson et al., Cosmic Visions Dark Energy: Small Projects Portfolio

February 15,  2018

• • Daniel Martens on using BOSS data to analyze intrinsic alignment effects on redshift space distortion parameters.

February 8,  2018

• • Hoshino et al., Luminous Red Galaxies in Clusters: Central Occupation, Spatial Distributions, and Mis-centering

February 1,  2018

• • Osato et al., Strong orientation dependence of surface mass density profiles of dark haloes at large scales

  • Matt Digman on super sample covariance.

January 18,  2018

• • Mukherjee et al., FSD: Frequency Space Differential measurement of CMB spectral distortions

  • Alam et al., Cosmic web dependence of galaxy clustering and quenching in SDSS

  • Paranjape et al., The dependence of galaxy clustering on tidal environment in the Sloan Digital Sky Survey

  • Zarrouk et al., The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: measurement of the growth rate of structure from the anisotropic correlation function between redshift 0.8 and 2.2

January 9,  2018

• • Alsing et al., Massive optimal data compression and density estimation for scalable, likelihood-free inference in cosmology

  • Lehmann et al., The Maximal-Density Mass Function for Primordial Black Hole Dark Matter

November 29,  2017

• • Kim et al., There Is No Missing Satellites Problem

  • Cless & Garcia-Bellido, Seven Hints for Primordial Black Hole Dark Matter

November 8,  2017

• • Hasegawa & Kawasaki,Cogenesis of LIGO Primordial Black Holes and Dark Matter

  • Takiwaki & Kotake, Anisotropic emission of neutrino and gravitational-wave signals from rapidly rotating core-collapse supernovae

  • Laplante et al., Helium Reionization Simulations. III. The Helium Lyman-α Forest

November 1,  2017

• • Jahmour Givans, Summer Research discussion

  • Schmittfull & Seljak, Parameter Constraints from Cross-Correlation of CMB Lensing with Galaxy Clustering

October 25,  2017

• • Denise Schmitz, Seminar: "Time Evolution of Galaxy Intrinsic Alignments"

October 11,  2017

• • Rachel Mandelbaum, Weak Lensing for Precision Cosmology

  • Nguyen et al., Measuring the small-scale matter power spectrum with high-resolution CMB lensing

  • Castorina & White., Beyond the plane-parallel approximation for redshift surveys

  • Samushia et al., Geometric Biases in Power Spectrum Measurements

October 4,  2017

• • Wibking et al., Emulating galaxy clustering and galaxy-galaxy lensing into the deeply nonlinear regime: methodology, information, and forecasts

  • de Graaff et al., Missing baryons in the cosmic web revealed by the Sunyaev-Zel'dovich Effect

  • Samuroff et al., Dark Energy Survey Year 1 Results: The Impact of Galaxy Neighbours on Weak Lensing Cosmology with im3shape

Sep 27,  2017

• • Tejos et al., Stochastic Order Redshift Technique: a simple, efficient and robust method to improve cosmological redshift measurements

  • LIGO Announcement

Sep 20,  2017

• • Kaurov, Stochasticity in the 21cm power spectrum at the epoch of reionization and cosmic dawn

  • Patej & Eisenstein, Analyzing BAO in Sparse Spectroscopic Samples via Cross-Correlation with Dense Photometry

Sep 13,  2017

• • Blazek et al., Beyond linear galaxy alignments

• Gebhardt & Jeong, 2-FAST: Fast and Accurate Computation of Projected Two-point Functions

Sep 6,  2017

• • Gatti et al., Dark Energy Survey Year 1 Results: Cross-Correlation Redshifts - Methods and Systematics Characterization

  • DES year 1 results: http://www.darkenergysurvey.org/des-year-1-cosmology-results-papers/

Aug 23,  2017

• • Schmit & Pritchard, Emulation of reionization simulations for Bayesian inference of astrophysics parameters using neural networks

  • Abbot et al., GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2

  • Hlozek et al., Using the Full Power of the Cosmic Microwave Background to Probe Axion Dark Matter

Aug 2,  2017

• • Addison et al., Elucidating ΛCDM: Impact of Baryon Acoustic Oscillation Measurements on the Hubble Constant Discrepancy

  • Henning et al, Measurements of the Temperature and E-Mode Polarization of the CMB from 500 Square Degrees of SPTpol Data

  • Upadhye, Neutrino mass and dark energy constraints from redshift-space distortions

  • Davis et al., Cross-Correlation Redshift Calibration Without Spectroscopic Calibration Samples in DES Science Verification Data

  • Reimberg & Bernardeau, Large deviations theory approach to cosmic shear calculations: the one-point aperture mass

• https://arxiv.org/abs/1411.1094

Jul 26,  2017

• • Hirata et al., Detecting primordial gravitational waves with circular polarization of the redshifted 21 cm line: I. Formalism

  • Mishra & Hirata, Detecting primordial gravitational waves with circular polarization of the redshifted 21 cm line: II. Forecasts

  • Joudaki et al., KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering

Jul 19,  2017

• • Feeney et al.,  Clarifying the Hubble constant tension with a Bayesian hierarchical model of the local distance ladder

  • Miranda et al., Finding structure in the dark: coupled dark energy, weak lensing, and the mildly nonlinear regime

  • Amon et al., KiDS-i-800: Comparing weak gravitational lensing measurements in same-sky surveys

  • Louis et al., Measuring Polarized Emission in Clusters in the CMB S4 Era

  • Penrose, Correlated "noise" in LIGO gravitational wave signals: an implication of Conformal Cyclic Cosmology

  • Smith et al., What if the gravitational waves detected in 2015 were strongly lensed by massive galaxy clusters?

  • Harada et al., Spins of primordial black holes formed in the matter-dominated phase of the Universe

  • Koo & Lee, Detection of the Intrinsic Spin Alignments in Isolated Spiral Pairs: Another Local Anomaly?

  • Hirata et al., Detecting primordial gravitational waves with circular polarization of the redshifted 21 cm line: I. Formalism

  • Mishra & Hirata, Detecting primordial gravitational waves with circular polarization of the redshifted 21 cm line: II. Forecasts

  • Rubin et al., The Discovery of a Gravitationally Lensed Supernova Ia at Redshift 2.22

  • Ravenni et al., Primordial non-Gaussianity with μ-type and y-type spectral distortions: exploiting Cosmic Microwave Background polarization and dealing with secondary sources

Jul 12,  2017

• • Hirata, https://arxiv.org/abs/1707.03358, "Small-scale structure and the Lyman-α forest baryon acoustic oscillation feature"

  • Guo et al., https://arxiv.org/abs/1707.01999, "Constraining the HI-Halo Mass Relation From Galaxy Clustering"

  • Renk et al., https://arxiv.org/abs/1707.02263, "Galileon Gravity in Light of ISW, CMB, BAO and H0 data"

Jul 05,  2017

• • Aylor et al., https://arxiv.org/abs/1706.10286, "A Comparison of Cosmological Parameters Determined from CMB Temperature Power Spectra from the South Pole Telescope and the Planck Satellite"

  • Yao et al., https://arxiv.org/abs/1707.01072, "Effects of Self-Calibration of Intrinsic Alignment on Cosmological Parameter Constraints from Future Cosmic Shear Surveys"

  • Efstathiou & Lemos, https://arxiv.org/abs/1707.00483, "Problems with KiDS"

  • Venumadhav et al., https://arxiv.org/abs/1707.00003, "Gravitational Microlensing During Caustic Crossings"

  • Krause et al., https://arxiv.org/abs/1706.09359, "Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses"

Jun 28,  2017

• • Seljak et al., https://arxiv.org/abs/1706.06645, "Towards optimal extraction of cosmological information from nonlinear data"

  • Rodríguez et al., https://arxiv.org/abs/1706.07704, "Comparison and contrast of test-particle and numerical-relativity waveform templates"

  • Roldan, https://arxiv.org/abs/1706.08428,  "CMB anisotropies at all orders: the non-linear Sachs-Wolfe formula"

Jun 21,  2017

• • van Uitert et al., https://arxiv.org/abs/1706.05004, "KiDS+GAMA: Cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing and angular clustering"

  • Klein et al., https://arxiv.org/abs/1706.06577, "A Multi-component Matched Filter Cluster Confirmation Tool for eROSITA: Initial Application to the RASS and DES-SV Datasets"

  • Lewis et al., https://arxiv.org/abs/1706.02673, "Emission-angle and polarization-rotation effects in the lensed CMB"

• https://arxiv.org/abs/1706.02892

Jun 7,  2017

• • Deutsch et al., https://arxiv.org/abs/1705.08907, "Polarized Sunyaev Zel'dovich tomography"

  • Minoda et al., https://arxiv.org/abs/1705.10054, "Thermal Sunyaev-Zel'dovich effect in the intergalactic medium with primordial magnetic fields"

  • Gall et al., https://arxiv.org/abs/1705.10806v1, "An updated Type II supernova Hubble diagram"

  • Kuhnel et al., https://arxiv.org/abs/1705.10361, "Primordial Black-Hole and Macroscopic Dark-Matter Constraints with LISA"

  • Green, https://arxiv.org/abs/1705.10818, "Astrophysical uncertainties on stellar microlensing constraints on multi-Solar mass primordial black hole dark matter"

  • Shin et al., https://arxiv.org/abs/1705.11167, "The ellipticity of galaxy cluster halos from satellite galaxies and weak lensing"

May 31,  2017

• • White and Padmanabhan, 2017, https://arxiv.org/abs/1705.09669, "Matched filtering with interferometric 21cm experiments"

  • Emami and Smoot, 2017, https://arxiv.org/abs/1705.09924, "Observational Constraints on the Primordial Curvature Power Spectrum"

  • Kovetz, https://arxiv.org/abs/1705.09182, "Probing Primordial-Black-Hole Dark Matter with Gravitational Waves"

  • Deutsch et al., https://arxiv.org/abs/1705.08907, "Polarized Sunyaev Zel'dovich tomography"

  • Uhlemann et al., https://arxiv.org/abs/1705.08901, "A question of separation: disentangling tracer bias and gravitational nonlinearity with counts-in-cells statistics"

May, 17  2017

• • Laurent et al., 2017, https://arxiv.org/abs/1705.04718, "Clustering of quasars in SDSS-IV eBOSS: study of potential systematics and bias determination"

  • Ross et al., 2017, https://arxiv.org/abs/1705.05442, "Optimized Clustering Estimators for BAO Measurements Accounting for Significant Redshift Uncertainty"

  • Herbel et al., 2017, https://arxiv.org/abs/1705.05386, "The redshift distribution of cosmological samples: a forward modeling approach"

  • Aghamousa et al., 2017, https://arxiv.org/abs/1705.05234, "A non-parametric consistency test of the ΛCDM model with Planck CMB data"

  • Assassi et al., 2017, https://arxiv.org/abs/1705.05022, "Efficient Evaluation of Cosmological Angular Statistics"

May, 11  2017

• • Scottez et al., 2017, https://arxiv.org/abs/1705.02629, "Testing the accuracy of clustering redshift with simulations"

  • Masters et al., 2017, https://arxiv.org/abs/1704.06665, "The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1"

  • Keck Array 2017, https://arxiv.org/abs/1705.02523, "BICEP2 / Keck Array IX: New Bounds on Anisotropies of CMB Polarization Rotation and Implications for Axion-Like Particles and Primordial Magnetic Fields"

April, 19  2017

• • Mackenzie et al., 2017, https://arxiv.org/abs/1704.03814, "Evidence against a supervoid causing the CMB Cold Spot"

  • Davis and Fairbairn, 2017, https://arxiv.org/abs/1704.05073, "A "nu" look at gravitational waves: The black hole birth rate from neutrinos combined with the merger rate from LIGO"

  • Merten et al., 2017, https://arxiv.org/abs/1704.05072, "Characterising dark matter haloes with computer vision"

  • Heavens et al., 2017, https://arxiv.org/abs/1704.03467, "No evidence for extensions to the standard cosmological model"

  • Liao et al., 2017, https://arxiv.org/abs/1704.04329, "Test of the FLRW metric and curvature with strong lens time delays"

  • LIGO collaboration, 2017, https://arxiv.org/abs/1704.04628, "Search for intermediate mass black hole binaries in the first observing run of Advance LIGO"

April, 5  2017

• • Nagy et al., 2017, https://arxiv.org/abs/1704.00215, "A New Limit on CMB Circular Polarization from SPIDER"

  • Di Valentino et al. 2017, https://arxiv.org/abs/1704.00762, "Constraining Dark Energy Dynamics in Extended Parameter Space"

  • Nakama et al. 2017, https://arxiv.org/abs/1703.10559, "Shedding light on the small-scale crisis with CMB spectral distortions"

  • Levshakov and Kozlov 2017, https://arxiv.org/abs/1703.10149, "Fine-structure transitions as a tool for studying variation of alpha at high redshifts"

March, 29  2017

• • Speaker: Alex Mead

  • "Is the spherical-collapse model of halo formation useful?"

  • Abstract: I will discuss differences in non-linear structure formation between cosmological models that are designed so as to share a linear-theory power spectrum at redshift zero, but that differ in their growth histories. Simulations of these cosmologies are seen to share a large-scale structure skeleton, but differ in the details of their halo populations. I will demonstrate that these differences can be largely understood via the cosmology dependence of spherical-collapse-model predictions for the formation times and average densities of the haloes. This fact can then be used to generate per-cent level accurate non-linear matter power spectra for a range of dark energy models.

March, 22  2017

• • Dvornik et al., 2017, https://arxiv.org/abs/1703.06657, "A KiDS Weak Lensing Analysis of Assembly Bias in GAMA Galaxy Groups"

  • Gerosa, Berti, 2017. https://arxiv.org/abs/1703.06223, "First or Second Generation? Black Hole Census with Gravitational Wave Observations"

  • Fishbach et al., 2017. https://arxiv.org/abs/1703.06869, "Are LIGO's Black Holes Made From Smaller Black Holes?"

March, 8  2017

• • Baumann et al., 2017, https://arxiv.org/abs/1703.00894, "Phases of New Physics in the BAO Spectrum"

  • Anselmi et al. 2017, https://arxiv.org/abs/1703.01275,"The Linear Point: A cleaner cosmological standard ruler"

  • Radice 2017, https://arxiv.org/abs/1703.02046, "General-Relativistic Large-Eddy Simulations of Binary Neutron Star Mergers"

March, 1  2017

• • Dvorkin & Barausse, 2017, https://arxiv.org/abs/1702.06964, "The nightmare scenario: measuring the stochastic gravitational-wave background from stalling massive black-hole binaries with pulsar-timing arrays"

  • Masui et al., 2017, https://arxiv.org/abs/1702.06552, "Two- and Three-dimensional Probes of Parity in Primordial Gravity Waves"

  • Hopkins et al., 2017, https://arxiv.org/abs/1702.06148, "FIRE-2 Simulations: Physics versus Numerics in Galaxy Formation"

  • Inayoshi et al. 2017, https://arxiv.org/abs/1702.06529, "Identifying stellar binary black hole formation channels from the imprint of their center-of-mass acceleration in their gravitational wave signal"

  • Shirasaki et al. 2017, https://arxiv.org/abs/1702.07085, "Large-Scale Clustering as a Probe of the Origin and the Host Environment of Fast Radio Bursts"

  • Bao et al, 2017, https://arxiv.org/abs/1702.06959, "Quantum Circuit Cosmology: The Expansion of the Universe Since the First Qubit"

  • Dai & Venumadhav, 2017, https://arxiv.org/abs/1702.04724, "On the waveforms of gravitationally lensed gravitational waves"

  • Our Ami Choi will discuss ways in which overlapping wide-area surveys can be leveraged to investigate photometric redshift bias and shear multiplicative measurement bias based on various combinations of lensing and clustering cross-correlations from spectroscopic, photometric and CMB surveys such as CFHTLenS, RCSLenS, KiDS, BOSS, WiggleZ, and Planck.

February, 22  2017

• • Sheldon & Huff, 2017, https://arxiv.org/abs/1702.02601, "Practical Weak Lensing Shear Measurement with Metacalibration"

  • Huff & Mandelbaum, 2017, https://arxiv.org/abs/1702.02600, "Metacalibration: Direct Self-Calibration of Biases in Shear Measurement"

February, 15  2017

• • Comparat et al., 2017, https://arxiv.org/pdf/1702.01628.pdf, "Accurate Mass and Velocity Functions of Dark Matter Halos"

  • Busch et al., 2017, https://arxiv.org/pdf/1702.01682.pdf, "Assembly Bias and Splashback in Galaxy Clusters"

  • Baxter et al., 2017, https://arxiv.org/pdf/1702.01722.pdf, "The Halo Boundary of Galaxy Clusters in the SDSS"

  • Jang et al., 2017, https://arxiv.org/pdf/1702.01118.pdf, "The Tip of the Red Giant Branch Distance to Type IA Supernova Host Galaxies, and the Value of the Hubble Constant"

  • Hoffman et al., 2017, http://www.nature.com/articles/s41550-016-0036, "The dipole repeller"

February, 08  2017

• • Guest speaker: David Cinabro, "Search For Type Ia Supernova NUV-Optical Subclasses"

February, 01  2017

• • Local speaker: Ashely Ross, "Things to consider when planning a large-scale structure survey and how this relates to BOSS, eBOSS, DESI, and DES”

  • Abbott et al., 2017, https://arxiv.org/pdf/1701.07709.pdf, "First Search for Gravitational Waves from Known Pulsars with Advanced LIGO"

  • Klypin et al., 2017, https://arxiv.org/pdf/1701.05690.pdf, "Dark Matter Statistics for Large Galaxy Catalogs: Power Spectra and Covariance Matrices"

January, 25  2017

• • Speaker: Susmita Adhikari, "Outskirts of Dark Matter Halos"

  • Speaker: Kaze Wong, "Advanced LIGO lensing rate predictions"

January, 11  2017

• • Castorina et al., 2017, https://arxiv.org/pdf/1609.05157.pdf, "On the spatial distribution of neutral hydrogen in the Universe: bias and shot-noise of the HI Power Spectrum"

  • Park et al., 2015, https://arxiv.org/pdf/1507.05353v2.pdf, "Joint Analysis of Galaxy-Galaxy Lensing and Galaxy Clustering: Methodology and Forecasts for DES"

  • Bohm et al., 2017,https://arxiv.org/pdf/1701.01886.pdf, "Bayesian weak lensing tomography: Reconstructing the 3D large-scale distribution of matter with a lognormal prior"

  • Chatterjee et al., 2017, https://arxiv.org/pdf/1701.01098.pdf, "The direct localization of a fast radio burst and its host"

  • Marcote et al., 2017, https://arxiv.org/pdf/1701.01099.pdf, "The Repeating Fast Radio Burst FRB 121102 as Seen on Milliarcsecond Angular Scales"

  • Tendulkar et al., 2017, https://arxiv.org/pdf/1701.01100.pdf, "The Host Galaxy and Redshift of the Repeating Fast Radio Burst FRB 121102"

  • Lingam & Loeb, 2017, https://arxiv.org/pdf/1701.01109.pdf, "Fast Radio Bursts from Extragalactic Light Sails"

December, 14  2016

• • Hu and Joyce 2016, https://arxiv.org/abs/1612.02454, "Separate Universes beyond General Relativity"

  • Baker and Trodden 2016, https://arxiv.org/abs/1612.02004, "Multi-Messenger Time Delays from Lensed Gravitational Waves"

  • LIGO 2016, https://arxiv.org/abs/1612.02029, "Upper Limits on the Stochastic Gravitational-Wave Background from Advanced LIGO's First Observing Run"

  • LIGO 2016, https://arxiv.org/abs/1612.02030, "Directional limits on persistent gravitational waves from Advanced LIGO's first observing run"

  • Modi et al. 2016, https://arxiv.org/abs/1612.01621, "Halo bias in Lagrangian Space: Estimators and theoretical predictions"

  • Paranjape and Padmanabhan 2016, https://arxiv.org/abs/1612.02833, "Halo assembly bias from Separate Universe simulations"

  • Brouwer et al. 2016, https://arxiv.org/abs/1612.03034, "First test of Verlinde's theory of Emergent Gravity using Weak Gravitational Lensing measurements"

  • Fleury et al. 2016, https://arxiv.org/abs/1612.03726, "How does the cosmic large-scale structure bias the Hubble diagram?"

  • Sehgal et al. 2016, https://arxiv.org/abs/1612.03898, "Internal Delensing of Cosmic Microwave Background Acoustic Peaks"

  • Bonus: Prof. Chris Hirata will give a short review on modified gravity.

December, 1  2016

• • Leauthaud et al. 2016, https://arxiv.org/pdf/1611.08606.pdf, "Lensing is Low - Cosmology, Galaxy Formation, or New Physics?"

November, 17 2016

    Special talk: 

    Michael Wilson

    University of Edinburgh

    "Geometric and growth rate tests of gravity with the linearised galaxy distribution"

    Abstract:

    This talk will outline the consistency of the VIPERS PDR-2 census of the galaxy distribution at z=0.8 with the expansion history and linear growth rate predicted by General Relativity and a Planck (2015) cosmology.  These may be inferred from the observed anisotropy of the galaxy power spectrum, which is sensitive to both the coherent infall of galaxies towards clusters (outflow from voids) and the assumption of an expansion history differing from the true one.

    I will then present the results of including a simple density transform prior to the analysis; this tackles the principal cause of non-linearity by down-weighting the most massive structures and extends the validity of theoretical models.  Moreover, this weighting would amplify signatures of modified gravity in ‘shielded’ models and represents a higher-order statistic, which contains information beyond that available to the power spectrum.

    Finally, the final data release of the VIPERS spectroscopic survey will be on Nov 18th (http://vipers.inaf.it).  I will detail the characteristics of the survey and describe the breadth of the accompanying clustering analyses.

• • Rao et al. 2016, https://arxiv.org/abs/1611.04602, "Modeling the Radio Foreground for detection of CMB spectral distortions from Cosmic Dawn and Epoch of Reionization"

  • Akitsu et al. 2016, https://arxiv.org/abs/1611.04723, "Super-Survey Tidal Effect on Redshift-space Power Spectrum"

  • Hu et al. 2016, https://arxiv.org/abs/1611.04599, "Dark Cosmic Rays"

  • Kitching et al. 2016, https://arxiv.org/abs/1611.04954, "The Limits of Cosmic Shear"

  • Kovetz et al. 2016,https://arxiv.org/pdf/1611.01157.pdf , "The Black Hole Mass Function from Gravitational Wave Measurements"

November, 10  2016

• • Patton et al. 2016, https://arxiv.org/abs/1611.01486, "Cosmological constraints from the convergence 1-point probability distribution"

  • Park et al. 2016, https://arxiv.org/abs/1611.02139, "The cosmological principle is not in the sky"

  • Kovetz et al. 2016, https://arxiv.org/abs/1611.01157, "The Black Hole Mass Function from Gravitational Wave Measurements"

  • Eggemeier et al. 2016, https://arxiv.org/abs/1611.01160, "Cosmology with Phase Statistics: Parameter Forecasts and Detectability of BAO"

  • King and Lubin 2016, https://arxiv.org/abs/1606.04112, "Circular polarization of the CMB: Foregrounds and detection prospects"

  • Review: CMB Circular Polarization

November, 3  2016

• • Melchior et al. 2016, https://arxiv.org/abs/1610.06890, "Weak-lensing mass calibration of redMaPPer galaxy clusters in Dark Energy Survey Science Verification data"

  • Zu et al 2016, https://arxiv.org/abs/1611.00366, "On the Level of Cluster Assembly Bias in SDSS"

October, 27 2016

    Special talk: 

    Patrick Breysse

    John Hopkins University

    "High-Redshift Astrophysics Using Every Photon"

    Abstract:

    Large galaxy surveys have dramatically improved our understanding of the complex processes which govern gas dynamics and star formation in the nearby universe. However, we know far less about the most distant galaxies, as existing high-redshift observations can only detect the very brightest sources. Intensity mapping surveys provide a promising tool to access this poorly-studied population. By observing emission lines with low angular resolution, these surveys can make use of every photon in a target line to study faint emitters which are inaccessible using traditional techniques. With upcoming carbon monoxide experiments in mind, I will demonstrate how an intensity map can be used to measure the luminosity function of a galaxy population, and in turn how these measurements will allow us to place robust constraints on the cosmic star formation history. I will then show how cross-correlating CO isotopologue lines will make it possible to study gas dynamics within the earliest galaxies in unprecedented detail.

• • Melchior et al. 2016, https://arxiv.org/abs/1610.06890, "Weak-lensing mass calibration of redMaPPer galaxy clusters in Dark Energy Survey Science Verification data"

  • Nielsen et al. 2016, http://www.nature.com/articles/srep35596, "Marginal evidence for cosmic acceleration from Type Ia supernovae"

  • Bartolo et al. 2016, https://arxiv.org/abs/1610.06481, "Science with the space-based interferometer LISA. IV: Probing inflation with gravitational waves"

  • Meerburg et al. 2016, https://arxiv.org/abs/1610.06559, "Prospects for Cosmological Collider Physics"

October, 20  2016

• • Benson et al. 2016, https://arxiv.org/pdf/1610.01057v1.pdf, "The Mass Function of Unprocessed Dark Matter Halos and Merger Tree Branching Rates"

  • Joudaki et al. 2016, https://arxiv.org/pdf/1610.04606.pdf, "KiDS-450: Testing Extensions to the Standard Cosmological Model"

  • Review: The Sunyaev-Zeldovich Effect: https://ned.ipac.caltech.edu/level5/Birkinshaw/paper.pdf

October, 6  2016

• • Rodriguez-Gomez et al., https://arxiv.org/abs/1609.09498, "The role of mergers and halo spin in shaping galaxy morphology"

  • Qu et al. 2016, http://arxiv.org/abs/1609.07243, "A chronicle of galaxy mass assembly in the EAGLE simulation"

September, 29  2016

• • Lacki 2016, http://arxiv.org/pdf/1609.05931.pdf, "The Log Log Prior for the Frequency of Extraterrestrial Intelligences" 

  • Qu et al. 2016, http://arxiv.org/abs/1609.07243, "A chronicle of galaxy mass assembly in the EAGLE simulation"

  • Prat et al. 2016, http://arxiv.org/abs/1609.08167, "Galaxy bias from galaxy-galaxy lensing in the DES Science Verification Data"

September, 22  2016

• • Liu et al. 2016, http://arxiv.org/pdf/1609.04401v1.pdf, "Spherical Harmonic Analysis of Intensity Mapping Power Spectra "

  • Casertano et al. 2016, http://arxiv.org/pdf/1609.05175.pdf, "A test of Gaia Data Release 1 parallaxes: implications for the local distance scale"

  • Smith et al. 2016, http://arxiv.org/pdf/1609.05901.pdf, "Sensitivity to a Frequency-Dependent Circular Polarization in an Isotropic Stochastic Gravitational Wave Background"

September, 15  2016

• • Chiang et al. 2016, http://arxiv.org/pdf/1609.01701v1.pdf, "Quintessential Scale Dependence from Separate Universe Simulations"

  • Vlah et al. 2016, http://arxiv.org/pdf/1609.02908v1.pdf, "The Gaussian streaming model and Lagrangian effective field theory"

September, 8  2016

• • Samuroff et al. 2016, http://arxiv.org/pdf/1607.07910v1.pdf, "Simultaneous Constraints on Cosmology and Photometric Redshift Bias from Weak Lensing and Galaxy Clustering

  • Matthee et al. 2016, http://arxiv.org/pdf/1608.08218.pdf#navpanes=0&toolbar=1, "The origin of scatter in the stellar mass - halo mass relation of central galaxies in the EAGLE simulation" 

September, 1  2016

• Martins et. al. 2016, http://arxiv.org/pdf/1606.07261v2.pdf, "Real-time cosmography with redshift derivatives"

  • Caldwell et al. 2016, http://arxiv.org/pdf/1608.08138.pdf, "Dust Polarization Maps and Interstellar Turbulence"