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Constraint on dark matter annihilation with dark star formation using Fermi extragalactic diffuse gamma-ray background data
Yuan Q(袁强); Yuan, Q; Yue, B; Zhang, B; Chen, XL
2011
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
期号4页码:20
通讯作者[Yuan, Qiang] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Yuan, Qiang ; Zhang, Bing] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA ; [Yue, Bin ; Chen, Xuelei] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China ; [Yue, Bin] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China ; [Chen, Xuelei] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
文章类型Article
摘要It has been proposed that during the formation of the first generation stars there might be a "dark star" phase in which the power of the star comes from dark matter annihilation. The adiabatic contraction process to form the dark star would result in a highly concentrated density profile of the host halo at the same time, which may give enhanced indirect detection signals of dark matter. In this work we investigate the extragalactic gamma-ray background from dark matter annihilation with such a dark star formation scenario, and employ the isotropic gamma-ray data from Fermi-LAT to constrain the model parameters of dark matter. The results suffer from large uncertainties of both the formation rate of the first generation stars and the subsequent evolution effects of the host halos of the dark stars. We find, in the most optimistic case for gamma-ray production via dark matter annihilation, the expected extragalactic gamma-ray flux will be enhanced by 1-2 orders of magnitude. In such a case, the annihilation cross section of the supersymmetric dark matter can be constrained to the thermal production level, and the leptonic dark matter model which is proposed to explain the positron/electron excesses can be well excluded. Conversely, if the positron/electron excesses are of a dark matter annihilation origin, then the early Universe environment is such that no dark star can form.
关键词first stars dark matter theory gamma ray theory
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
DOI10.1088/1475-7516/2011/04/020
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000291259000020
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被引频次:3[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/311005/240364
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Yuan Q,Yuan, Q,Yue, B,et al. Constraint on dark matter annihilation with dark star formation using Fermi extragalactic diffuse gamma-ray background data[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2011(4):20.
APA 袁强,Yuan, Q,Yue, B,Zhang, B,&Chen, XL.(2011).Constraint on dark matter annihilation with dark star formation using Fermi extragalactic diffuse gamma-ray background data.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(4),20.
MLA 袁强,et al."Constraint on dark matter annihilation with dark star formation using Fermi extragalactic diffuse gamma-ray background data".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .4(2011):20.
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