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arXiv 0810.4110hep-phastro-ph
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来自轻子暗物质的宇宙射线

Cosmic rays from Leptonic Dark Matter

Chuan-Ren Chen, Fuminobu Takahashi

摘要:

如果暗物质具有轻子数,那么很自然地预期暗物质湮灭和/或衰变主要产生标准模型轻子,而产生的反质子的数量可以忽略不计。为了说明这样一个简单的想法,我们考虑一个方案,右手sneutrino暗物质通过微小的R宇称破坏相互作用衰变到标准模型粒子。有趣的是,带电轻子和中微子是直接产生的,它们可以导致预测的正电子分数出现一个尖峰。此外,右手中微子的衰变也产生了弥散的连续伽马射线,这可能是EGRET观测到的过量伽马射线的原因,而初级反质子通量可以被抑制。PAMELA和FGST天文台将检验这些关于正电子、伽马射线和反质子的宇宙射线通量的预测。

英文摘要:

If dark matter possesses a lepton number, it is natural to expect the dark-matter annihilation and/or decay mainly produces the standard model leptons, while negligible amount of the antiproton is produced. To illustrate such a simple idea, we consider a scenario that a right-handed sneutrino dark matter decays into the standard model particles through tiny R-parity violating interactions. Interestingly enough, charged leptons as well as neutrinos are directly produced, and they can lead to a sharp peak in the predicted positron fraction. Moreover, the decay of the right-handed sneutrino also generates diffuse continuum gamma rays which may account for the excess observed by EGRET, while the primary antiproton flux can be suppressed. Those predictions on the cosmic-ray fluxes of the positrons, gamma rays and antiprotons will be tested by the PAMELA and FGST observatories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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