MIT Astrophysics Colloquium 11/29/2022 — New Insight Into Cosmology And The Galaxy-Halo Connection From Non-Linear Scales (speaker: Frank Van Den Bosch, Yale)

Tuesday November 29, 2022 4:00 pm

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.
Host: Paul Schechter


Event Contact

Debbie Meinbresse