Bounds on very low reheating scenarios after Planck

الأصل · EN

We consider the case of very low reheating scenarios (T RH(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 T RH>4.1 MeV is obtained from Big Bang Nucleosynthesis, while T RH>4.3 MeV from Planck data for very light (∑ mᵢ = 0.06 eV) neutrinos. If neutrino masses are allowed to vary, Planck data yield T RH>4.7 MeV, the most stringent bound on the reheating temperature to date. Neutrino masses as large as 1 eV are possible for very low reheating temperatures.