Enhanced Dark Matter Annihilation Rate for Positron and Electron Excesses from Q-ball Decay
arXiv:0904.0969 · doi:10.1103/PhysRevLett.103.151301
Abstract
We show that Q-ball decay in Affleck-Dine baryogenesis models can account for dark matter when the annihilation cross-section is sufficiently enhanced to explain the positron and electron excesses observed by PAMELA, ATIC and PPB-BETS. For Affleck-Dine baryogenesis along a d = 6 flat direction, the reheating temperature is approximately 30 GeV and the Q-ball decay temperature is in the range 10-100 MeV. The LSPs produced by Q-ball decay annihilate down to the observed dark matter density if the cross-section is enhanced by a factor ~ 10^3 relative to the thermal relic cross-section.
4 pages, version to be published in Physical Review Letters
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Cited by in corpus (8)
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- Cold Dark Matter in non-Standard Cosmologies, PAMELA, ATIC and Fermi LAT
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