Gravitino Warm Dark Matter with Entropy Production

Details Gravitino Warm Dark Matter with Entropy Production Gravitino Warm Dark Matter with Entropy Production

2001-08-09

arxiv.org/abs/astro-ph/0108172v2

JHEP 0305:067,2003

Astronomy and Astrophysics

Astrophysics

8 pages, one figure

Scientific paper

10.1088/1126-6708/2003/05/067

Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter. Recent measurements of the matter density of the universe and of cosmic structures at the dwarf galaxy scale rule out the simplest gravitino models with thermal freeze-out. We construct a model where the decay of the messenger particles that transmit the supersymmetry breaking to the observable sector generates the required entropy to dilute the gravitino relic density by the required factor of a few to come in line with observations. The model is natural, and requires only that the coupling of the messenger sector to the standard model be set so that the decay happens at the appropriate time.

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