טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentZinman Erez
SubjectStudy of Dark Matter Halo Clustering in the Presence of
Massive Neutrinos
DepartmentDepartment of Physics
Supervisor Dr. Vincent Desjacques


Abstract


The mass of neutrinos is an essential ingredient of the Standard Model
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.