Speaker
Nicola Barbieri
(INFN Ferrara)
Description
If reheating occurs at sufficiently low temperatures (below $20$ MeV), neutrinos--assuming they are populated only through weak interactions--do not have enough time to reach thermal equilibrium before decoupling. We present an updated analysis of cosmological models with very low reheating scenarios, including a more precise computation of neutrino distribution functions, leveraging the latest datasets from cosmological surveys. At the $95\%$ confidence level, we establish a lower bound on the reheating temperature of $T_\mathrm{RH} > 5.96$ MeV, representing the most stringent constraint to date.
Author
Nicola Barbieri
(INFN Ferrara)
