Speaker
Takuya Hasegawa
(SOKENDAI (KEK))
Description
We study a possible minimum value of reheating temperature in terms of Big-Bang Nucleosynthesis by considering both radiative and hadronic decays of massive particles. In the current study, neutrino oscillation and neutrino self-interactions are also taken into account. We adopt updated observational bounds on the primordial abundance of light elements. We obtain the lower bound on the reheating temperature of 4 MeV -- 5 MeV depending on the mass and hadronic branching ratio of the massive particles. Compared with cases with 100% radiative decay, we find that the change due to hadronic decays on the lower bound is of the order of O(10)%, whereas those of neutrino oscillation and neutrino self-interaction are of the order of O(1)%.
