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Leptonic dark matter annihilation in the evolving universe: constraints and implications
Yuan, Qiang1,6; Yue, Bin2,6; Bi, Xiao-Jun1,3; Chen, Xuelei2,3; Zhang, Xinmin4,5
2010-10-01
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
期号10
摘要The cosmic electron and positron excesses have been explained as possible dark matter (DM) annihilation products. In this work we investigate the possible effects of such a DM annihilation scenario during the evolution history of the Universe. We first calculate the extragalactic gamma-ray background (EGRB), which is produced through the final state radiation of DM annihilation to charged leptons and the inverse Compton scattering between electrons/positrons and the cosmic microwave background. The DM halo profile and the minimal halo mass, which are not yet well determined from the current N-body simulations, are constrained by the EGRB data from EGRET and Fermi telescopes. Then we discuss the impact of such leptonic DM models on cosmic evolution, such as the reionization and heating of intergalactic medium, neutral Hydrogen 21 cm signal and suppression of structure formation. We show that the impact on the Hydrogen 21 cm signal might show interesting signatures of DM annihilation, but the influence on star formation is not remarkable. Future observations of the 21 cm signals could be used to place new constraints on the properties of DM.
关键词Dark Matter Theory Gamma Ray Theory Recombination
DOI10.1088/1475-7516/2010/10/023
收录类别SCI
语种英语
WOS记录号WOS:000283577600012
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被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7809
专题星系宇宙学研究部
作者单位1.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
4.Chinese Acad Sci, Inst High Energy Phys, Div Theoret Phys, Beijing 100049, Peoples R China
5.Chinese Acad Sci, TPCSF, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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Yuan, Qiang,Yue, Bin,Bi, Xiao-Jun,et al. Leptonic dark matter annihilation in the evolving universe: constraints and implications[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(10).
APA Yuan, Qiang,Yue, Bin,Bi, Xiao-Jun,Chen, Xuelei,&Zhang, Xinmin.(2010).Leptonic dark matter annihilation in the evolving universe: constraints and implications.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(10).
MLA Yuan, Qiang,et al."Leptonic dark matter annihilation in the evolving universe: constraints and implications".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .10(2010).
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