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CATEGORIES:Cosmology Lunch
SUMMARY:Galaxy Formation in Separate Universes - Alex Barr
 eira
DTSTART;TZID=Europe/London:20200217T130000
DTEND;TZID=Europe/London:20200217T140000
UID:TALK135931AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/135931
DESCRIPTION:The statistics of galaxies observed by spectroscop
 ic and imaging surveys are sensitive to the large-
 scale environment within which the galaxies formed
 . The "response" of galaxy properties to the prese
 nce of these "environments" is thus an important i
 ngredient in the construction of theoretical model
 s to explain the observed data. These "responses" 
 can be measured in so-called Separate Universe sim
 ulations\, in which the effect of long-wavelength 
 perturbations on small-scale structure formation i
 s mimicked by changing the cosmology (i.e.\, by go
 ing to a "separate universe"). In this talk\, I wi
 ll describe measurements of the responses of the t
 otal matter power spectrum and galaxy number count
 s (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 e
 ffects leave on higher-order correlation functions
  (including covariances)\, as well as to estimate 
 galaxy bias parameters that are important to const
 rain inflation.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Roo
 m]
CONTACT:William Coulton
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