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题名: Nonthermal production of WIMPs, cosmic e(+/-) excesses, and gamma rays from the Galactic Center
作者: Bi, Xiao-Jun ;  Brandenberger, Robert ;  Gondolo, Paolo ;  Li, Tianjun ;  Yuan, Qiang ;  Zhang, Xinmin
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
学科分类: Physics
通讯作者: Bi, XJ , Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
部门归属: [Bi, XJ; Yuan, Q] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China; [Bi, XJ] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China; [Brandenberger, R] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada; [Brandenberger, R; Zhang, XM] Chinese Acad Sci, Inst High Energy Phys, Div Theoret Phys, Beijing 10049, Peoples R China; [Brandenberger, R; Zhang, XM] Chinese Acad Sci, TPCSF, Beijing 100049, Peoples R China; [Brandenberger, R; Gondolo, P; Li, TJ; Zhang, XM] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; [Brandenberger, R] CERN, Div Theory, CH-1211 Geneva, Switzerland; [Gondolo, P] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA; [Li, TJ] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China; [Li, TJ] Texas AM Univ, George P & Cynthia W Mitchell Inst Fundamental Ph, College Stn, TX 77843 USA
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.
资助者: Natural Sciences Foundation of China[10773011, 10821504, 10533010, 10675136]; Chinese Academy of Sciences[KJCX3-SYW-N2, KJCX2.YW.W10]; Theory Division of the Institute of High Energy Physics (IHEP); CERN Theory Division; NSERC; Canada Research Chairs Program; NSF[PHY-0756962]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000272313300015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5214
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
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):-.
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