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Geng, CQ; Huang, D; Tsai, LH; Geng, CQ (reprint author), Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan.
Imprint of multicomponent dark matter on AMS-02
发表期刊PHYSICAL REVIEW D
语种英语
关键词Cosmic-ray Electrons Gamma-ray Positron Fraction Pamela Excess Propagation Energies Models Bounds Mass
摘要The multicomponent decaying dark matter (DM) scenario is investigated to explain the possible excesses in the positron fraction by PAMELA and recently confirmed by AMS-02, and in the total e(+) + e(-) flux observed by Fermi-LAT. By performing the chi(2) fits, we find that two DM components are already enough to give a reasonable fit of both AMS-02 and Fermi-LAT data. The best-fitted results show that the heavier DM component with its mass of 1.5 TeV dominantly decays through the mu channel, while the lighter one of 100 GeV decays mainly through the tau channel. As a by-product, the fine structure around 100 GeV observed by AMS-02 and Fermi-LAT can be naturally explained by the dropping due to the lighter DM component. With the obtained model parameters by the fitting, we calculate the diffuse gamma-ray emission spectrum in this two-component DM scenario, and find that it is consistent with the data measured by Fermi-LAT. We also construct a microscopic particle DM model to naturally realize the two-component DM scenario, and point out an interesting neutrino signal which will possibly be measured in the near future by IceCube.
2014
ISSN1550-7998
卷号89期号:5页码:55021
学科领域Physics
DOI10.1103/PhysRevD.89.055021
收录类别SCI
项目资助者National Center for Theoretical Science; National Science Council [NSC-101-2112-M-007-006-MY3]; National Tsing Hua University [102N1087E1, 102N2725E1] ; National Center for Theoretical Science; National Science Council [NSC-101-2112-M-007-006-MY3]; National Tsing Hua University [102N1087E1, 102N2725E1] ; National Center for Theoretical Science; National Science Council [NSC-101-2112-M-007-006-MY3]; National Tsing Hua University [102N1087E1, 102N2725E1] ; National Center for Theoretical Science; National Science Council [NSC-101-2112-M-007-006-MY3]; National Tsing Hua University [102N1087E1, 102N2725E1]
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/15803
专题理论物理所科研产出_SCI论文
通讯作者Geng, CQ (reprint author), Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan.
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Geng, CQ,Huang, D,Tsai, LH,et al. Imprint of multicomponent dark matter on AMS-02[J]. PHYSICAL REVIEW D,2014,89(5):55021.
APA Geng, CQ,Huang, D,Tsai, LH,&Geng, CQ .(2014).Imprint of multicomponent dark matter on AMS-02.PHYSICAL REVIEW D,89(5),55021.
MLA Geng, CQ,et al."Imprint of multicomponent dark matter on AMS-02".PHYSICAL REVIEW D 89.5(2014):55021.
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