Speaker
Dr
Stefano Gariazzo
(IFIC-CSIC/University of Valencia)
Description
We discuss the phenomenology of neutrino decoupling in the early universe, by summarising the details of the calculation in standard and non-standard scenarios. We present the state-of-the-art calculation of the effective number of neutrino species in the early universe (Neff) in the three-neutrino case, which gives Neff=3.044, and show how the result can change when additional particles (such as sterile neutrinos or decoupled scalar fields) or non-standard cosmological scenarios (low reheating models) are considered. Implications for Big Bang Nucleosynthesis are also briefly discussed.
