|M.Sc Student||Zinman Erez|
|Subject||Study of Dark Matter Halo Clustering in the Presence of|
|Department||Department of Physics||Supervisor||Dr. Vincent Desjacques|
The mass of neutrinos is an essential ingredient of the
of particle physics. Unlike solar oscillations experiments, which probe neutrino mass
differences through the neutrino oscillations, cosmological data constrains the absolute mass scale of neutrinos. Recent studies of dark matter halo collapse in cosmologies with massive neutrinos indicate there should be steplike features in the halo bias on the scale of the neutrino free-streaming. In this thesis, we show that this scale-dependent step imprinted by the massive neutrinos can be described with linear theory alone. To calculate this effect, we develop a two-fluid approximation, and provide a perturbative solution which recovers the numerical calculation at the percent level accuracy. We discuss the motivation, validity and underlying assumption of our simple "toy" model.