Résumé / Abstract Journal-club_Univers

Journal-club Univers / Journal-club Universe

« Large-scale clustering with counts-in-cells statistics »

Cora Uhlemann
Astron. Inst., Univ. Utrecht (Utrecht, Pays-Bas)

In this talk, I will describe how to follow the gravitational evolution of the large scale structure of matter in the Universe using counts-in-cells statistics. Based on the theory of large deviations, I will argue that spherical collapse dynamics can be used to predict the statistics of counts in spherical cells. I will then compare analytical predictions for counts-in-cells statistics against state of the art dark matter simulations showing that they can access a mildly nonlinear regime beyond what is commonly achievable with perturbative calculations. Finally, I will discuss the impact of the initial conditions and cosmological parameters on counts-in-cells statistics and comment on its future potential to constrain cosmology using future galaxy surveys by describing biased tracers and applying the formalism to angular clustering and weak lensing.
mardi 28 février 2017 - 11:15
Salle 281, Institut d'Astrophysique
Pages web du journal-club / Journal-club's webpage