High Energy Cosmic Rays from Decaying Supersymmetric Dark Matter
High Energy Cosmic Rays from Decaying Supersymmetric Dark Matter
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DOI：
10.1088/1126-6708/2009/05/110
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
Koji Ishiwata;S. Matsumoto;T. Moroi
中科院分区：
文献类型：
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作者：
Koji Ishiwata;S. Matsumoto;T. Moroi
受最近PAMELA和ATIC结果的启发，我们计算了最轻超粒子（LSP）暗物质衰变的电子和正电子通量。我们假设LSP是暗物质的主要成分，并考虑R宇称被非常弱地违反的情况，使得LSP的寿命达到10^26秒的量级。我们将看到，在这样选择寿命的情况下，衰变产生的宇宙射线电子和正电子可能是PAMELA和ATIC观测到的异常电子和正电子通量的来源。我们考虑的可能性，LSP是引力子，最轻的中性中微子，标量中微子，并讨论如何产生的通量依赖于暗物质模型。我们还讨论了γ射线和反质子的通量，并表明这些通量可以与PAMELA和ATIC异常解释的参数区域的观测值相一致。
Motivated by the recent PAMELA and ATIC results, we calculate the electron and positron fluxes from the decay of lightest-superparticle (LSP) dark matter. We assume that the LSP is the dominant component of dark matter, and consider the case that the R-parity is very weakly violated so that the lifetime of the LSP becomes of the order of 10^26 sec. We will see that, with such a choice of the lifetime, the cosmic-ray electron and positron from the decay can be the source of the anomalous electron and positron fluxes observed by PAMELA and ATIC. We consider the possibilities that the LSP is the gravitino, the lightest neutralino, and scalar neutrino, and discuss how the resultant fluxes depend on the dark-matter model. We also discuss the fluxes of gamma-ray and anti-proton, and show that those fluxes can be consistent with the observed value in the parameter region where the PAMELA and ATIC anomalies are explained.