Neutralino Relic Density Enhancement in Non-Standard Cosmologies

Details Neutralino Relic Density Enhancement in Non-Standard Cosmologies Neutralino Relic Density Enhancement in Non-Standard Cosmologies

2004-04-20

arxiv.org/abs/astro-ph/0404390v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures; Talk presented by S.Profumo at the XXXIXth Rencontres de Moriond on "Exploring the Universe", La Thuile, I

Scientific paper

The thermal relic abundance of species critically depends on the assumed underlying cosmological model. In the case of neutralinos, freeze-out takes place long before Big Bang Nucleosynthesis, which provides the strongest constraint on the evolution of the Hubble parameter in the Early Universe. We show that non-standard cosmologies, such as models featuring a quintessential scalar field or primordial anisotropies, can lead to large enhancements in the neutralino relic abundance, up to six orders of magnitudes. Within these scenarios, supersymmetric models with large neutralino annihilation cross sections may account for the whole inferred amount of cold dark matter, yielding on the other hand large indirect detection rates.

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