Nonthermal production of WIMPs, cosmic e(+/-) excesses, and gamma rays from the Galactic Center
文献类型：期刊论文
| 作者 | Bi, Xiao-Jun; Brandenberger, Robert; Gondolo, Paolo; Li, Tianjun ; Yuan, Qiang; Zhang, Xinmin; Bi, XJ , Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
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| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2009 |
| 卷号 | 80期号:10页码:- |
| 关键词 | Dark-matter Halos Interacting Massive Particles Positron Fraction Universe Annihilations Violation Mechanism Energies Galaxies Pamela |
| ISSN号 | 1550-7998 |
| 英文摘要 | In this paper we propose a dark matter model and study aspects of its phenomenology. Our model is based on a new dark matter sector with a U(1)(') gauge symmetry plus a discrete symmetry added to the standard model of particle physics. The new fields of the dark matter sector have no hadronic charges and couple only to leptons. Our model cannot only give rise to the observed neutrino mass hierarchy, but can also generate the baryon number asymmetry via nonthermal leptogenesis. The breaking of the new U(1)(') symmetry produces cosmic strings. The dark matter particles are produced nonthermally from cosmic string loop decay which allows one to obtain sufficiently large annihilation cross sections to explain the observed cosmic ray positron and electron fluxes recently measured by the PAMELA, ATIC, PPB-BETS, Fermi-LAT, and HESS experiments while maintaining the required overall dark matter energy density. The high velocity of the dark matter particles from cosmic string loop decay leads to a low phase space density and thus to a dark matter profile with a constant density core in contrast to what happens in a scenario with thermally produced cold dark matter where the density keeps rising towards the center. As a result, the flux of gamma rays radiated from the final leptonic states of dark matter annihilation from the Galactic center is suppressed and satisfies the constraints from the HESS gamma-ray observations. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000272313300015 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5214]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Bi, XJ , Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bi, Xiao-Jun,Brandenberger, Robert,Gondolo, Paolo,et al. Nonthermal production of WIMPs, cosmic e(+/-) excesses, and gamma rays from the Galactic Center[J]. PHYSICAL REVIEW D,2009,80(10):-. |
| APA | Bi, Xiao-Jun.,Brandenberger, Robert.,Gondolo, Paolo.,Li, Tianjun.,Yuan, Qiang.,...&Bi, XJ , Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China.(2009).Nonthermal production of WIMPs, cosmic e(+/-) excesses, and gamma rays from the Galactic Center.PHYSICAL REVIEW D,80(10),-. |
| MLA | Bi, Xiao-Jun,et al."Nonthermal production of WIMPs, cosmic e(+/-) excesses, and gamma rays from the Galactic Center".PHYSICAL REVIEW D 80.10(2009):-. |
入库方式： OAI收割
来源：理论物理研究所
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