Lepton number asymmetries and the lower bound on the reheating temperature

We show that the reheating temperature of a matter-domination era in the early universe can be pushed down to the neutrino decoupling temperature at around $2\mathrm{M}\mathrm{e}\mathrm{V}$ if the reheating takes place through non-hadronic decays of the dominant matter and neutrino-antineutrino asymmetries are still large enough, $\mathrm{\mid }L\mathrm{\mid }\gtrsim \mathcal{O}({10}^{-2})$ (depending on the neutrino flavor) at the end of reheating.