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Breit-Wigner enhancement considering the dark matter kinetic decoupling
Bi XJ(毕效军); Yin PF(殷鹏飞); Yuan Q(袁强); Bi, XJ; Yin, PF; Yuan, Q
2012
发表期刊PHYSICAL REVIEW D
卷号85期号:4页码:43526
摘要In this paper we study the Breit-Wigner enhancement of dark matter (DM) annihilation considering the kinetic decoupling in the evolution of DM freeze-out at the early Universe. Since the DM temperature decreases much faster (as 1/R-2) after kinetic decoupling than that in kinetic equilibrium (as 1/R), we find the Breit-Wigner enhancement of the DM annihilation rate after the kinetic decoupling will affect the DM relic density significantly. Focusing on the model parameters that try to explain the anomalous cosmic positron/electron excesses observed by PAMELA/Fermi/ATIC, we find the elastic scattering Xf -> Xf is not efficient in keeping dark matter in kinetic equilibrium, and the kinetic decoupling temperature T-kd is comparable to the chemical decoupling temperature T-f similar to O(10) GeV. The reduction of the relic density after Tkd is significant and leads to a limited enhancement factor similar to O(10(2)). Therefore, it is difficult to explain the anomalous positron/electron excesses in cosmic rays by DM annihilation and give the correct DM relic density simultaneously in the minimal Breit-Wigner enhancement model. We also mention that if the nonthermal DM velocity distribution after kinetic decoupling or new scattering processes are considered, this constraint could be changed.
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.85.043526
收录类别SCI
WOS记录号WOS:000300570700007
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被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224548
专题粒子天体物理中心
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Bi XJ,Yin PF,Yuan Q,et al. Breit-Wigner enhancement considering the dark matter kinetic decoupling[J]. PHYSICAL REVIEW D,2012,85(4):43526.
APA 毕效军,殷鹏飞,袁强,Bi, XJ,Yin, PF,&Yuan, Q.(2012).Breit-Wigner enhancement considering the dark matter kinetic decoupling.PHYSICAL REVIEW D,85(4),43526.
MLA 毕效军,et al."Breit-Wigner enhancement considering the dark matter kinetic decoupling".PHYSICAL REVIEW D 85.4(2012):43526.
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