We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Enhanced Dark Matter Annihilation Rate for Posi...
View graph of relations

« Back

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

Research output: Contribution to journalJournal article


Article number151301
<mark>Journal publication date</mark>6/10/2009
<mark>Journal</mark>Physical Review Letters
Number of pages4
<mark>Original language</mark>English


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