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arXiv 1210.3017astro-ph.CO
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结构形成对夏季风增强的暗物质湮灭的限制

Structure Formation Constraints on Sommerfeld-Enhanced Dark Matter Annihilation

C. Armendariz-Picon, Jayanth T. Neelakanta

摘要:

我们研究宇宙结构的增长的假设下,暗物质自我湮灭的平均截面倍的相对速度的比例因子的增长,增加被称为Sommerd-enhancement。在暗区的轻力载体增强了暗物质粒子湮灭的截面的模型中,这种演化是可以预期的,并且已经被调用,例如,解释过去报道的宇宙射线光谱中的异常。为了使我们的结果尽可能具有一般性,我们假设暗物质湮灭成一个相对论性的物种,只与标准模型的引力相互作用。这一假设也使我们能够测试宇宙微波背景数据所支持的额外相对论性物质是否来自于暗物质湮灭。我们没有找到证据的索末菲增强暗物质湮灭,并得出相应的上限的湮灭截面。

英文摘要:

We study the growth of cosmic structure under the assumption that dark matter self-annihilates with an averaged cross section times relative velocity that grows with the scale factor, an increase known as Sommerfeld-enhancement. Such an evolution is expected in models in which a light force carrier in the dark sector enhances the annihilation cross section of dark matter particles, and has been invoked, for instance, to explain anomalies in cosmic ray spectra reported in the past. In order to make our results as general as possible, we assume that dark matter annihilates into a relativistic species that only interacts gravitationally with the standard model. This assumption also allows us to test whether the additional relativistic species mildly favored by cosmic-microwave background data could originate from dark matter annihilation. We do not find evidence for Sommerfeld-enhanced dark matter annihilation and derive the corresponding upper limits on the annihilation cross-section.

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