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arXiv 1206.2371hep-ph
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黑暗共鸣

Dark Resonance

Haipeng An, Maxim Pospelov

摘要:

我们构建明确的粒子暗物质模型,在暗物质部门的吸引力创建一个狭窄的近阈值共振,定性地改变湮灭截面的能量依赖性。在这些模型中,暗物质湮灭的共振增强可以很容易地产生PAMELA和FERMI卫星上实验观察到的过量高能轻子。这些模型的显著特点是,当暗物质速度低于典型银河系速度时,湮灭截面的增强被关闭,从而自动满足了由CMB各向异性和卫星星系γ射线对暗物质湮灭的约束。

英文摘要:

We construct explicit models of particle dark matter where the attractive force in the dark matter sector creates a narrow near-threshold resonance that qualitatively changes the energy dependence of the annihilation cross section. In these models, the resonant enhancement of the dark matter annihilation can easily source the excess of energetic leptons observed by experiments on PAMELA and FERMI satellites. The distinct feature of these models is that by construction the enhancement of the annihilation cross section shuts off when the dark matter velocity falls below the typical Milky Way values, thus automatically satisfying constraints on dark matter annihilation imposed by the CMB anisotropies and gamma ray constraints from satellite galaxies.

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