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arXiv 1107.2408hep-phastro-ph.HEhep-ex
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IceCube结果对增强暗物质湮灭的限制

Constraints on Enhanced Dark Matter Annihilation from IceCube Results

Ivone F. M. Albuquerque, Leandro J. Beraldo e Silva, Carlos Pérez de los Heros

摘要:

由ATIC、PAMELA和Fermi-LAT望远镜测量的正电子和电子通量的过量可以用我们银河系中的暗物质湮灭来解释。然而,这需要大大提高暗物质湮灭的速率。有许多可能的增强机制,如索末菲效应或在我们的晕中存在暗物质团块。如果暗物质湮灭截面正在增强,那么地核中的暗物质湮灭也应该增强。在这里,我们使用IceCube 40字符串配置的最新结果来探测一般的增强场景。我们目前的结果作为暗物质-质子相互作用截面的函数,$σ_{χp}$加权的分支分数到中微子,$f_{ν\barν}$,作为一个通用的助推因子,$B_F$,参数化预期的增强湮灭率的函数。我们发现,暗物质模型,需要湮灭增强$\mathcal{O}(100)$或更多,并湮灭到中微子显着被排除在这些过剩的解释。我们还确定了整个IceCube望远镜可以探测的助推范围。

英文摘要:

Excesses on positron and electron fluxes measured by ATIC, and the PAMELA and Fermi--LAT telescopes can be explained by dark matter annihilation in our Galaxy. However, this requires large boosts on the dark matter annihilation rate. There are many possible enhancement mechanisms, such as the Sommerfeld effect or the existence of dark matter clumps in our halo. If enhancements on the dark matter annihilation cross section are taking place, the dark matter annihilation in the core of the Earth should also be enhanced. Here we use recent results from the IceCube 40-string configuration to probe generic enhancement scenarios. We present results as a function of the dark matter-proton interaction cross section, $σ_{χp}$ weighted by the branching fraction into neutrinos, $f_{ν\barν}$, as a function of a generic boost factor, $B_F$, which parametrizes the expected enhancement of the annihilation rate. We find that dark matter models which require annihilation enhancements of $\mathcal{O}(100)$ or more and that annihilate significantly into neutrinos are excluded as the explanation for these excesses. We also determine the boost range that can be probed by the full IceCube 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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