WIMP abundance and lepton (flavour) asymmetry

Details WIMP abundance and lepton (flavour) asymmetry WIMP abundance and lepton (flavour) asymmetry

2011-11-16

arxiv.org/abs/1111.3954v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 4 figures; v2:minor changes to some wordings

Scientific paper

We investigate how large lepton asymmetries affect the evolution of the early universe at times before big bang nucleosynthesis and in particular how they influence the relic density of WIMP dark matter. In comparison to the standard calculation of the relic WIMP abundance we find a decrease, depending on the lepton flavour asymmetry. We find an effect of up to 20 per cent for lepton flavour asymmetries $l_f= {\cal O}(0.1)$.

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