Bounds on very low reheating scenarios after Planck
Lattanzi, M.; de Salas, P. F.; Miele, G.; Mangano, G.; Pastor, S.; Pisanti, O.
Spain, Italy
Abstract
We consider the case of very low reheating scenarios [TRH∼O (MeV ) ] with a better calculation of the production of the relic neutrino background (with three-flavor oscillations). At 95% confidence level, a lower bound on the reheating temperature TRH>4.1 MeV is obtained from big bang nucleosynthesis, while TRH>4.7 MeV from Planck data (allowing neutrino masses to vary), the most stringent bound on the reheating temperature to date. Neutrino masses as large as 1 eV are possible for very low reheating temperatures.