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题名: The 130 GeV gamma-ray line and Sommerfeld enhancements
作者: Chen, J ;  Zhou, YF
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2013
期号: 4, 页码:17
关键词: DARK-MATTER ;  PARTICLES ;  ABUNDANCE ;  ELECTRONS ;  ENERGIES
学科分类: Physics
通讯作者: Chen, J (reprint author), Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Chen, Jing; Zhou, Yu-Feng] Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
英文摘要: Recently, possible indications of line spectral features in the Fermi-LAT photon spectrum towards the galactic center have been reported. If the distinct line features arise from dark matter (DM) annihilation into gamma X (X = gamma; Z(0) or h(0)), the corresponding annihilation cross-section is unnaturally large for typical loop-induced radiative processes. On the other hand, it is still too small to be responsible for the observed DM relic density. We show that the mechanism of Sommerfeld enhancement with scalar force-carrier can provide a simple solution to these puzzles. The possibly large Sommerfeld enhancement of the cross-section for s-wave DM annihilation can significantly reduce the required effective couplings between DM and charged particles in typical loop diagrams. The DM particles necessarily annihilate into scalar force-carriers through tree-level p-wave process, which can dominate the total DM annihilation cross-section at freeze out, resulting in the correct thermal relic density, but has subdominant contributions to the DM annihilation today due to velocity suppression. We perform detailed analysis on the effects of p-wave Sommerfeld enhancement on freeze out. The results show that with the constraints from the thermal relic density, the required effective couplings can be reduced by an order of magnitude.
资助者: National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Project of Knowledge Innovation Program (PKIP) of the Chinese Academy of Science
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000318556200017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15388
Appears in Collections:理论物理所2013年知识产出 _期刊论文

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Recommended Citation:
Chen, J,Zhou, YF. The 130 GeV gamma-ray line and Sommerfeld enhancements[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2013(4):17.
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