Positron/Gamma-Ray Signatures of Dark Matter Annihilation and Big-Bang Nucleosynthesis

Details Positron/Gamma-Ray Signatures of Dark Matter Annihilation and Big-Bang Nucleosynthesis Positron/Gamma-Ray Signatures of Dark Matter Annihilation and Big-Bang Nucleosynthesis

2008-10-10

arxiv.org/abs/0810.1892v4

Phys.Rev.D79:063514,2009; Erratum-ibid.D80:029907,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 4 figures; added references and discussion; included PAMELA data; to appear in PRD; corrected the electromagnetic-emi

Scientific paper

10.1103/PhysRevD.79.063514

The positron excess observed by the PAMELA experiment may come from dark matter annihilation, if the annihilation cross section is large enough. We show that the dark matter annihilation scenarios to explain the positron excess may also be compatible with the discrepancy of the cosmic lithium abundances between theory and observations. The wino-like neutralino in the supersymmetric standard model is a good example for it. This scenario may be confirmed by Fermi satellite experiment.

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