Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB, United Kingdom.
Phys Rev Lett. 2009 Oct 9;103(15):151301. doi: 10.1103/PhysRevLett.103.151301. Epub 2009 Oct 6.
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 of 10-100 MeV. The lightest supersymmetric particles produced by Q-ball decay annihilate down to the observed dark matter density if the cross section is enhanced by a factor approximately 10(3) relative to the thermal relic cross section.
我们表明，在 Affleck-Dine 重子生成模型中，Q 球衰变可以解释暗物质，当湮灭截面足够增强以解释 PAMELA、ATIC 和 PPB-BETS 观测到的正电子和电子过剩时。对于沿着 d=6 平坦方向的 Affleck-Dine 重子生成，再加热温度约为 30GeV，Q 球衰变温度在 10-100MeV 范围内。如果 Q 球衰变产生的最轻超对称粒子的湮灭截面相对于热遗迹截面增强约 10(3)倍，则可以湮灭到观测到的暗物质密度。
