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SUMMARY:Large-deviation statistics of the cosmic density field - Cora Uhle
 mann (University of Utrecht)
DTSTART:20161107T130000Z
DTEND:20161107T140000Z
UID:TALK67654@talks.cam.ac.uk
CONTACT:Tobias Baldauf
DESCRIPTION:In this talk\, I will describe how a large deviation principle
  can be used to follow the gravitational evolution of the large scale stru
 cture into the mildly nonlinear regime. This approach allows for analytica
 l predictions for counts-in-cells statistics that are beyond what is commo
 nly achievable via other statistics such as correlation functions. The ide
 a is to determine the mean cosmic densities within concentric spheres and 
 study their joint statistics. This symmetry allows to use spherical collap
 se dynamics which leads to surprisingly accurate predictions where standar
 d perturbative calculations usually break down. In particular\, I will sho
 w results for the density and velocity statistics in concentric cells in c
 omparison to state-of-the-art numerical simulations. Finally\, I will disc
 uss current progress to extend the formalism to include primordial non-Gau
 ssianity\, bias and cylindrical cells and exploit its potential to constra
 in cosmology using future surveys.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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