Résumé / Abstract Seminaire_GReCO

"A new approach to halo counting statistics: path-integral, non-spherical halo collapse and primordial non-Gaussianity"

P. S. Corasaniti
Lab. Univers et Théories (LUTH), Obs. Paris-Meudon-Nancay (Meudon, France)

The mass distribution of dark matter halos in the universe carries unique information on the non-linear gravitational processes that have shaped the late time cosmic structure formation. Due to the complexity of the non-linear collapse of dark matter density fluctuations, the halo mass function has been mainly investigate using numerical N-body simulations. In this talk I will review some recent theoretical advancements based on a path-integral formulation of the Excursion Set theory and present an analytical computation of the halo mass function for Gaussian and non-Gaussian initial conditions in the case of an effective stochastic barrier model which captures the main features of the non-spherical collapse of dark matter halos. This provides a mathematical description of halo mass function that explicitly depends on physical model parameters and which we find to be in remarkable agreement with Gaussian and non-Gaussian numerical N-body simulation results.

lundi 10 octobre 2011 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage