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Chen, J; Zhou, YF; 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.
The 130 GeV gamma-ray line and Sommerfeld enhancements
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Language英语
KeywordDark-matter Particles Abundance Electrons Energies
AbstractRecently, 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.
2013
ISSN1475-7516
Issue4Pages:17
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational 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 ; 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 ; 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 ; 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
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15388
Collection理论物理所科研产出_SCI论文
Corresponding AuthorChen, J (reprint author), Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Chen, J,Zhou, YF,Chen, J . The 130 GeV gamma-ray line and Sommerfeld enhancements[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2013(4):17.
APA Chen, J,Zhou, YF,&Chen, J .(2013).The 130 GeV gamma-ray line and Sommerfeld enhancements.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(4),17.
MLA Chen, J,et al."The 130 GeV gamma-ray line and Sommerfeld enhancements".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .4(2013):17.
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