Observational constraints on dark matter decaying via gravity portals  

作　　者：Xu-Dong Sun Ben-Zhong Dai 孙旭东;戴本忠(School of Physics and Astronomy,Yunnan University,Kunming 650091,China;Key Laboratory of Astroparticle Physics,Yunnan Province,Kunming 650091,China)

机构地区：[1]School of Physics and Astronomy,Yunnan University,Kunming 650091,China [2]Key Laboratory of Astroparticle Physics,Yunnan Province,Kunming 650091,China

出　　处：《Chinese Physics C》2020年第12期215-225,共11页中国物理C（英文版）

基　　金：Supported by National key research and development program 2018YFA0404204;the National Science Foundation of China(U1531131 and U1738211);the Science Foundation of Yunnan Province(2018FA004)。

摘　　要：Global symmetry can guarantee the stability of dark matter particles(DMps).However,the nonminimal coupling between dark matter(DM)and gravity can break the global symmetry of DMps,which in turn leads to their decay.Under the framework of nonminimal coupling between scalar singlet dark matter(ssDM)and gravity,it is worth exploring the extent to which the symmetry of ssDM is broken.It is suggested that the total number of decay products of ssDM cannot exceed current observational constraints.Along these lines,the data obtained with satellites such as Fermi-LAT and AMS-02 suggest that the scale of ssDM global symmetry breaking can be limited.Because the mass of many promising DM candidates is likely to be in the GeV-TeV range,we determine reasonable parameters for the ssDM lifetime within this range.We find that when the mass of ssDM is around the electroweak scale(246 GeV),the corresponding 3σlower limit of the lifetime of ssDM is 5.3×1026 s.Our analysis of ssDM around the electroweak scale encompasses the most abundant decay channels of all mass ranges so that the analysis of the behavior of ssDM under the influence of gravity is more comprehensive.

关 键 词：cosmology of theories beyond the SM dark matter beyond standard model 

分 类 号：P145.9[天文地球—天体物理]