Gravitino Warm Dark Matter with Entropy Production

Journal Article · Thu Aug 09 00:00:00 EDT 2001 · Journal of High Energy Physics

OSTI ID:965505

Baltz, Edward A; Murayama, Hitoshi

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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Physics Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 965505
• Report Number(s): LBNL-48726; TRN: US0903639
• Journal Information: Journal of High Energy Physics, Related Information: Journal Publication Date: 30 May 2003; ISSN 1029-8479
• Country of Publication: United States
• Language: English

Related Subjects

72
DECAY
ENTROPY
KEV RANGE
NONLUMINOUS MATTER
PRODUCTION
STANDARD MODEL
SUPERSYMMETRY
UNIVERSE
Supersymmetry Phenomenology
Dark Matter