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Constraint on dark matter annihilation with dark star formation using Fermi extragalactic diffuse gamma-ray background data
Yuan, Qiang1,2; Yue, Bin3,4; Zhang, Bing2; Chen, Xuelei3,5
2011-04-01
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Issue4
AbstractIt 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.
KeywordFirst Stars Dark Matter Theory Gamma Ray Theory
DOI10.1088/1475-7516/2011/04/020
Indexed BySCI
Language英语
WOS IDWOS:000291259000020
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7896
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
2.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
4.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
5.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Qiang,Yue, Bin,Zhang, Bing,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).
APA Yuan, Qiang,Yue, Bin,Zhang, Bing,&Chen, Xuelei.(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).
MLA Yuan, Qiang,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).
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