Lepton number asymmetries and the lower bound on the reheating temperature

2017/08/16 by Gabriela Barenboim, Wan-Il Park, Barenboim, Gabriela +1
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph.CO

paper · pdf · doi:10.48550/arxiv.1708.04899

8 pages, 4 figures: new figures added, minor changes in conclusions, matches the version published in JCAP

arxiv created 2018/01/10 · arxiv updated 2018/01/11

Abstract

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 \rm MeV if the reheating takes place through non-hadronic decays of the dominant matter and neutrino-antineutrino asymmetries are still large enough, |L| \gtrsim O(10^-2) (depending on the neutrino flavor) at the end of reheating.

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