University of Cambridge > > Cosmology Lunch > Galaxy Formation in Separate Universes

Galaxy Formation in Separate Universes

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact William Coulton.

The statistics of galaxies observed by spectroscopic and imaging surveys are sensitive to the large-scale environment within which the galaxies formed. The “response” of galaxy properties to the presence of these “environments” is thus an important ingredient in the construction of theoretical models to explain the observed data. These “responses” can be measured in so-called Separate Universe simulations, in which the effect of long-wavelength perturbations on small-scale structure formation is mimicked by changing the cosmology (i.e., by going to a “separate universe”). In this talk, I will describe measurements of the responses of the total matter power spectrum and galaxy number counts (galaxy bias) carried out with Separate Universe simulations of the IllustrisTNG galaxy formation model. I will further show that these measurements allow one to calculate the impact that baryonic effects leave on higher-order correlation functions (including covariances), as well as to estimate galaxy bias parameters that are important to constrain inflation.

This talk is part of the Cosmology Lunch series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.


© 2006-2024, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity