High energy cosmic rays from the decay of gravitino dark matter
High energy cosmic rays from the decay of gravitino dark matter
复制标题
DOI：
10.1103/physrevd.78.063505
复制
发表时间：
2008-05
影响因子：
5
通讯作者：
Koji Ishiwata;S. Matsumoto;T. Moroi
中科院分区：
文献类型：
--
作者：
Koji Ishiwata;S. Matsumoto;T. Moroi
在具有R宇称破坏的超对称模型框架下研究了引力子暗物质衰变产生的高能宇宙线。即使违反了R宇称，引力子的寿命，这被认为是最轻的超粒子，可以比宇宙的当前年龄更长，如果违反R宇称的相互作用足够弱。我们详细计算了引力子暗物质衰变产生的γ射线和正电子的通量。我们还讨论了这种情况下，目前和未来的高能宇宙射线观测的影响。特别是，我们表明，过剩的伽玛射线观测到的高能伽玛射线实验望远镜和高能反物质望远镜观测到的大的正电子分数的伽玛射线通量可以同时解释的宇宙射线从引力子暗物质的衰变。
We study high energy cosmic rays from the decay of the gravitino dark matter in the framework of supersymmetric model with R-parity violation. Even though R parity is violated, the lifetime of the gravitino, which is assumed to be the lightest superparticle, can be longer than the present age of the Universe if R-parity violating interactions are weak enough. We have performed a detailed calculation of the fluxes of gamma ray and positron from the decay of the gravitino dark matter. We also discuss the implication of such a scenario to present and future observations of high energy cosmic rays. In particular, we show that the excess of the gamma-ray flux observed by Energetic Gamma Ray Experiment Telescope and the large positron fraction observed by High Energy Antimatter Telescope can be simultaneously explained by the cosmic rays from the decay of the gravitino dark matter.