期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2008/10/005
关键词
dark matter; big bang nucleosynthesis; physics of the early universe
资金
- US Department of Energy (DOE) [DE-FC02-94ER40818]
- National Science Foundation [PHY05-51164]
- European Community's Sixth Framework Programme [MTKD-CT-2005-029466 (2006-2010)]
- Helmholtz Association [VH-NG-006]
- European Network of Theoretical Astroparticle Physics ILIAS/N6 [RII3-CT-2004-506222]
- French ANR [BLAN07-2-194882]
We investigate scenarios in which a charged, long-lived scalar particle decouples from the primordial plasma in the early Universe. We compute the number density at the time of freeze-out considering both the cases of Abelian and non-Abelian interactions and including the effect of Sommerfeld enhancement at low initial velocity. We also discuss as an extreme case the maximal cross section that fulfils the unitarity bound. We then compare these number densities to the exotic nuclei searches for stable relics and to the BBN bounds on unstable relics and draw conclusions for the cases of a stau or stop NLSP in supersymmetric models with a gravitino or axino LSP.
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