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Enhanced Dark Matter Annihilation Rate for Positron and Electron Excesses from Q-ball Decay

Research output: Contribution to journalJournal article

Published

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Journal publication date6/10/2009
JournalPhysical Review Letters
Journal number15
Volume103
Number of pages4
Original languageEnglish

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.

Bibliographic note

4 pages, version to be published in Physical Review Letters