Thermal axion constraints in non-standard thermal histories

Details Thermal axion constraints in non-standard thermal histories Thermal axion constraints in non-standard thermal histories

2008-12-27

arxiv.org/abs/0812.4721v2

AIP Conf.Proc.1166:119-125,2009

Astronomy and Astrophysics

Astrophysics

Submitted conference proceedings, based on a talk presented at Dark Matter '08 in Marina del Rey. Based on work discussed in

Scientific paper

10.1063/1.3232168

There is no direct evidence for radiation domination prior to big-bang nucleosynthesis, and so it is useful to consider how constraints to thermally-produced axions change in non-standard thermal histories. In the low-temperature-reheating scenario, radiation domination begins at temperatures as low as 1 MeV, and is preceded by significant entropy generation. Axion abundances are then suppressed, and cosmological limits to axions are significantly loosened. In a kination scenario, a more modest change to axion constraints occurs. Future possible constraints to axions and low-temperature reheating are discussed.

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