CCAPP Cosmology Lunch meets on Wednesdays at 1:00 pm in the Price Place (PRB M2005)
- 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"
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, 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, 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
November, 17 2016
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
October, 27 2016
John Hopkins University
"High-Redshift Astrophysics Using Every Photon"
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.
October, 20 2016
October, 6 2016
September, 1 2016