《A review of indirect searches for particle dark matter》

  • 来源专题:中国科学院紫金山天文台科技信息监测服务
  • 编译者: zhoubz
  • 发布时间:2016-04-11
  • The indirect detection of dark matter annihilation and decay using observations of photons, charged cosmic rays, and neutrinos offers a promising means of identifying the particle nature of this elusive component of the universe. The last decade has seen substantial advances in observational data sets, complemented by new insights from numerical simulations, which together have enabled for the first time strong constraints on dark matter particle models, and have revealed several intriguing hints of possible signals. This review provides an introduction to indirect detection methods and an overview of recent results in the field.

相关报告
  • 《Gamma-ray triangles: a possible signature of asymmetric dark matter in indirect searches》

    • 来源专题:中国科学院紫金山天文台科技信息监测服务
    • 编译者:zhoubz
    • 发布时间:2016-04-11
    • We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realisation of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches.
  • 《Higgs exotic decays in general NMSSM with self-interacting dark matter》

    • 来源专题:中国科学院紫金山天文台科技信息监测服务
    • 编译者:zhoubz
    • 发布时间:2016-04-11
    • Under current LHC and dark matter constraints, the general NMSSM can have self-interacting dark matter to explain the cosmological small structure. In this scenario, the dark matter is the light singlino-like neutralino ($\chi$) which self-interacts through exchanging the light singlet-like scalars ($h_1, a_1$). These light scalars and neutralinos inevitably interact with the 125 GeV SM-like Higgs boson ($h_{SM}$), which cause the Higgs exotic decays $h_{SM} \to h_1 h_1, a_1 a_1, \chi\chi$. We first demonstrate the parameter space required by the explanation of the cosmological small structure and then display the Higgs exotic decays. We find that in such a parameter space the Higgs exotic decays can have branching ratios of a few percent, which should be accessible in the future $e^+e^-$ colliders