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arXiv 1106.4568hep-phastro-ph.GAastro-ph.HE
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Cosmic Ray -暗物质散射:Gamma Ray天空中(不对称)暗物质的新特征

Cosmic Ray-Dark Matter Scattering: a New Signature of (Asymmetric) Dark Matter in the Gamma Ray Sky

Stefano Profumo, Lorenzo Ubaldi

摘要:

我们考虑了银河宇宙射线电子和质子在末态光子辐射下被暗物质散射的过程。这一过程为用伽马射线寻找银河系暗物质提供了一种新的方法。我们认为,对于一个通用的弱相互作用的大质量粒子,如共同湮灭或速度依赖的横截面的影响,伽马射线发射的宇宙射线散射的暗物质通常小于从暗物质对湮灭。然而,如果暗物质粒子不能成对湮灭,例如在非对称暗物质场景中的情况,则具有终态光子发射的宇宙射线散射提供了一个独特的窗口来检测来自暗物质的伽马射线信号。我们估计预期的通量水平和它的光谱特征为一个通用的超对称设置,我们还讨论了偶极和发光的暗物质。我们表明,在某些情况下,伽马射线发射可能是大到足以检测到的费米大面积望远镜。

英文摘要:

We consider the process of scattering of Galactic cosmic-ray electrons and protons off of dark matter with the radiation of a final-state photon. This process provides a novel way to search for Galactic dark matter with gamma rays. We argue that for a generic weakly interacting massive particle, barring effects such as co-annihilation or a velocity-dependent cross section, the gamma-ray emission from cosmic-ray scattering off of dark matter is typically smaller than that from dark matter pair-annihilation. However, if dark matter particles cannot pair-annihilate, as is the case for example in asymmetric dark matter scenarios, cosmic-ray scattering with final state photon emission provides a unique window to detect a signal from dark matter with gamma rays. We estimate the expected flux level and its spectral features for a generic supersymmetric setup, and we also discuss dipolar and luminous dark matter. We show that in some cases the gamma-ray emission might be large enough to be detectable with the Fermi Large Area Telescope.

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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