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SUMMARY:Galaxy Formation in Separate Universes - Alex Barreira
DTSTART:20200217T130000Z
DTEND:20200217T140000Z
UID:TALK135931@talks.cam.ac.uk
CONTACT:William Coulton
DESCRIPTION:The statistics of galaxies observed by spectroscopic and imagi
 ng surveys are sensitive to the large-scale environment within which the g
 alaxies formed. The "response" of galaxy properties to the presence of the
 se "environments" is thus an important ingredient in the construction of t
 heoretical models to explain the observed data. These "responses" can be m
 easured in so-called Separate Universe simulations\, in which the effect o
 f long-wavelength perturbations on small-scale structure formation is mimi
 cked 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 mo
 del. I will further show that these measurements allow one to calculate th
 e impact that baryonic effects leave on higher-order correlation functions
  (including covariances)\, as well as to estimate galaxy bias parameters t
 hat are important to constrain inflation.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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