Constraints on dark matter annihilation and decay from the isotropic gamma-ray background

Constraints on dark matter annihilation and decay from the isotropic gamma-ray background
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各向同性伽马射线背景对暗物质湮灭和衰变的约束

DOI:
10.1088/1674-1137/41/4/045104
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发表时间:
2016-02
期刊:
影响因子:
3.6
通讯作者:
Peng-Fei Yin
Peng-Fei Yin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wei Liu;Xiao-Jun Bi;Su-Jie Lin;Peng-Fei Yin

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我们研究了费米-LAT各向同性伽马射线背景(IGRB)观测对暗物质(DM)湮灭/衰变的约束。我们考虑了河外和银河系DM组分的贡献。对于DM湮灭,考虑了河外DM晕的演化。我们发现,在某些DM亚晕模型下的IGRB湮灭约束条件可以与矮球星系和CMB的观测结果相媲美。我们还使用IGRB的结果来约束解释最新的AMS-02电子-正电子异常的参数区域。我们发现大多数DM湮灭/衰变通道被最新的费米-LAT IGRB观测强烈否定;只有DM衰变到μ+μ−和4个μ通道可能是有效的。
We study the constraints on dark matter (DM) annihilation/decay from the Fermi-LAT Isotropic Gamma-Ray Background (IGRB) observation. We consider the contributions from both extragalactic and galactic DM components. For DM annihilation, the evolution of extragalactic DM halos is taken into account. We find that the IGRB annihilation constraints under some DM subhalo models can be comparable to those derived from the observations of dwarf spheroidal galaxies and CMB. We also use the IGRB results to constrain the parameter regions accounting for the latest AMS-02 electron-positron anomaly. We find that the majority of DM annihilation/decay channels are strongly disfavored by the latest Fermi-LAT IGRB observation; only DM decays to μ+μ− and 4μ channels may be valid.
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发表时间: 2009-04
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