机构:
MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA
Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USAMIT, Ctr Theoret Phys, Cambridge, MA 02139 USA
Berger, Carola F.
[1
,2
]
Covi, Laura
论文数: 0引用数: 0
h-index: 0
机构:
DESY Theory Grp, D-22603 Hamburg, GermanyMIT, Ctr Theoret Phys, Cambridge, MA 02139 USA
dark matter;
big bang nucleosynthesis;
physics of the early universe;
D O I:
10.1088/1475-7516/2008/10/005
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
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.