Interpretation of the Galactic gamma-ray excess with the dark matter indicated by ^(8)Be and ^(4)He anomalous transitions  

作　　者：Lian-Bao Jia Tong Li 贾连宝;李佟(School of Science,Southwest University of Science and Technology,Mianyang 621010,China;School of Physics,Nankai University,Tianjin 300071,China)

机构地区：[1]School of Science,Southwest University of Science and Technology,Mianyang 621010,China [2]School of Physics,Nankai University,Tianjin 300071,China

出　　处：《Chinese Physics C》2021年第6期15-22,共8页中国物理C（英文版）

基　　金：The work of T.Li was Supported by the the National Natural Science Foundation of China(11975129,12035008);“the Fundamental Research Funds for the Central Universities”,Nankai University(63196013);L.-B.Jia was Supported by the Longshan academic talent research supporting program of SWUST(18LZX415)。

摘　　要：The long-standing Galactic center gamma-ray excess could be explained by GeV dark matter(DM)annihilation,but the DM interpretation seems to conflict with recent joint limits from different astronomical scale observations such as dwarf spheroidal galaxies,the Milky Way halo,and galaxy groups/clusters.Motivated by ^(8)Be and ^(4)He anomalous transitions with possible new interactions mediated by a vector boson X,we consider a small fraction of DM mainly annihilating into a pair of on-shell vector bosons followed by in this paper.The Galactic center gamma-ray excess is explained by this DM cascade annihilation.The gamma rays are mainly from inverse Compton scattering emission,and the DM cascade annihilation could be compatible with joint astrophysical limits and meanwhile be allowed by AMS-02 positron observation.The direct detection of this model is also discussed.

关 键 词：Galactic center gamma-ray excess Atomki anomalies dark matter 

分 类 号：P145.9[天文地球—天体物理]