Abundance of halos and voids in the excursion set approach

Ixandra Achitouv


Our picture of the present universe is mainly composed of voids and dark matter halos, the building blocks of cosmic structure. The halo mass functions quantifies their number density as function of mass, and it is a key to predicting several large-scale structure observables. In this talk, I will review the lastest theoretical advancements on the derivation of a halo mass function which encodes physical aspects of the halo process and is capable of reproducing numerical N-body simulation results with unprecedented accuracy.