October 11, 2022

Speaker: Frank van den Bosch (Yale University)

Contact Information: frank.vandenbosch@yale.edu

Title: New Insight into Cosmology and the Galaxy-Halo Connection from Non-Linear Scales

Abstract: In our LCDM paradigm, galaxies form and reside in dark matter halos. Establishing the (statistical) relation between galaxies and dark matter halos, the `Galaxy-Halo connection', therefore gives important insight into galaxy formation, and also is a gateway to using the distribution of galaxies to constrain cosmological parameters. After a brief introduction to how clustering and gravitational lensing can be used to constrain the galaxy-halo connection, I show that several independent analyses all point towards a significant tension in cosmological parameters compared to the recent CMB results from the Planck satellite. I discuss the potential impact of assembly bias, and present satellite kinematics as a complementary and competitive method to constrain the galaxy-halo connection. After a brief historical overview of the use of satellite kinematics, I present a novel analysis, and show how it improves our knowledge of the galaxy-halo connection. I end with a re-examination of the cosmological tension, this time using satellite kinematics rather than gravitational lensing.

Visitor's room: Room 122

Visit Schedule:

Wednesday (12 Oct. 2022):

  • 9:30 a.m.: Jahmour Givans (Peyton 108A)

  • 10:00 a.m.: Thales Gutcke (Peyton 109)

  • 10:30 a.m.: Tomomi Sunayama (Peyton 111)

  • 11:00 a.m.: Oren Slone (Peyton 122)

  • 11:30 a.m.: Nicole Shibley (Peyton 122)

  • 12:00 p.m.: Arun Kannawadi (Peyton 122)

  • 12:30 p.m.: Wunch

  • 1:00 p.m.: Wunch

  • 1:30 p.m.: Jo Dunkley (Peyton 122)

  • 2:00 p.m.: Peter Melchior

  • 2:30 p.m.: Neta Bahcall (Peyton 137)

  • 3:00 p.m.: Jiaxuan Li (Peyton 122)

  • 3:30 p.m.: Romain Teyssier

  • 4:00 p.m.: ChangHoon Hahn

  • 4:30 p.m.: Jenny Greene

  • 5:00 p.m.: Roohi Dalal (Peyton 122)


Dinner Sign-up - add your name here:

Wednesday (12 Oct. 2022)

  1. Frank van den Bosch

  2. Faculty Host: Peter Melchior

  3. Postdoc Host: Shany Danieli

  4. Christian Kragh Jespersen


  6. Roohi Dalal

  7. Shaunak Modak

  8. ChangHoon Hahn

  9. In case a spot frees up: Thales, Romain

STUDENTS HAVE PRIORITY.

PLEASE NO MORE THAN 8 PEOPLE (it is more difficult to properly interact with the speaker in larger groups).