Enhanced Dark Matter Annihilation Rate for Positron and Electron Excesses from Q-ball Decay
High Energy Physics - Phenomenology
2009-10-29 v4 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
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.
Keywords
Cite
@article{arxiv.0904.0969,
title = {Enhanced Dark Matter Annihilation Rate for Positron and Electron Excesses from Q-ball Decay},
author = {John McDonald},
journal= {arXiv preprint arXiv:0904.0969},
year = {2009}
}
Comments
4 pages, version to be published in Physical Review Letters