Jan 9 – 13, 2023
Universidad Técnica Federico Santa María
Chile/Continental timezone

Neutrino decoupling in standard and non-standard scenarios

Jan 12, 2023, 2:30 PM
Room C201, Building C (Universidad Tecnica Federico Santa Maria)

Room C201, Building C

Universidad Tecnica Federico Santa Maria

parallel Neutrino Physics Parallel Session E


Dr Stefano Gariazzo (IFIC-CSIC/University of Valencia)


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.

Presentation materials