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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
Nonthermal production of WIMPs, cosmic e(+/-) excesses, and gamma rays from the Galactic Center
Source PublicationPHYSICAL REVIEW D
KeywordDark-matter Halos Interacting Massive Particles Positron Fraction Universe Annihilations Violation Mechanism Energies Galaxies Pamela
AbstractIn 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.
2009
ISSN1550-7998
Volume80Issue:10Pages:-
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNatural 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] ; 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] ; 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] ; 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]
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Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5214
CollectionSCI期刊论文
Corresponding AuthorBi, XJ , Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
Recommended Citation
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):-.
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