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

作　　者：刘伟 毕效军 林苏杰 殷鹏飞 

机构地区：[1]Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Physics C》2017年第4期128-140,共13页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11475189,11475191,11135009);973 Program of China(2013CB837000);Strategic Priority Research Program“The Emergence of Cosmological Structures”of the Chinese Academy of Sciences(XDB09000000)

摘　　要：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.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.

关 键 词：dark matter theory gamma-ray theory dark matter simulations gamma-rays： diffuse background 

分 类 号：P145.9[天文地球—天体物理] P172.3[天文地球—天文学]