corentincadiou

Astrophysicist


Is assembly bias driven by the saddle points of the cosmic web?

The mass function of the dark matter halos in which galaxies are found can be rather well approximated using the excursion set theory. Using this theory, we are able to predict the mass ditribution as well as the accretion rates and the formation times of halos. In this work, we have provided an extension to the excursion set theory to account for the anisotropy induced by the cosmic web, and especially the saddle points (center of filaments).
We provide two online representation of the typical density (blue) and the specific accretion rate (red) in the frame of a saddle point of the potential before a Zeldovich boost and after a Zeldovich boost.

The paper will be available soon on the Arxiv