Astro Seminar: "Halo Bias and its Evolution in the Peak Model"

Wed, 03/25/2015 - 14:00 - 16:00
Tobias Baldauf (IAS)

The clustering statistics of galaxies and their host haloes in current and upcoming Large Scale Structure surveys have the potential to put stringent constraints on cosmology and fundamental physics. The understanding of these statistics is complicated by the fact that both the initial conditions and the evolution of halo statistics differ from the underlying matter statistics. We study these complications in the framework of the peak model by first establishing agreement of proto-halo density and momentum statistics in simulations and peak model predictions. In a second step we follow the evolution of these conserved tracers and show that a finite velocity/momentum bias is retained, which contradicts simple Eulerian coevolution models in the literature. Finally, we give some perspective on how these models might improve our understanding of non-Poissonian stochasticity and BAO smoothing/reconstruction.

David Rittenhouse Laboratory, A6