Cosmic constraints rule out s-wave annihilation of light dark matter

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dc.creatorSchleicher, Dominik R. G.
dc.creatorGlover, Simon C. O.
dc.creatorBanerjee, Robi
dc.creatorKlessen, Ralf S.
dc.date2008-09-09
dc.date2009-01-12
dc.date.accessioned2026-07-07T12:46:29Z
dc.date.available2026-07-07T12:46:29Z
dc.descriptionLight dark matter annihilating into electron-positron pairs emits a significant amount of internal bremsstrahlung that may contribute to the cosmic gamma-ray background. The amount of emitted gamma-rays depends on the dark matter clumping factor. Recent calculations indicate that this value should be of order $10^6-10^7$. That allows us to calculate the expected gamma-ray background contribution from dark matter annihilation. We find that the light dark matter model can be ruled out if a constant thermally-averaged cross section is assumed (s-wave annihilation). For more massive dark matter candidates like neutralinos, however, cosmic constraints are weaker.
dc.description5 pages, 2 figures, accepted at PRD
dc.identifierhttps://arxiv.org/abs/0809.1523
dc.identifierhttp://arxiv.org/abs/0809.1523
dc.identifierPhys.Rev.D79:023515,2009
dc.identifierdoi:10.1103/PhysRevD.79.023515
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/221400
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCosmic constraints rule out s-wave annihilation of light dark matter
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