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arXiv 1609.02147hep-phastro-ph.HE
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受阻的暗物质

Impeded Dark Matter

Joachim Kopp, Jia Liu, Tracy R. Slatyer, Xiao-Ping Wang, Wei Xue

摘要:

我们考虑的暗物质模型中,质量分裂之间的暗物质粒子和它们的湮灭产物是微小的。与之前提出的禁暗物质方案相比,我们考虑的质量分裂要小得多,并且可以是正的或负的。为了强调这一修改,我们将我们的场景称为“受阻的暗物质“。我们证明,受阻暗物质可以很容易地实现,而不需要调整模型参数。对于负质量分裂,我们表明,湮没截面的阻碍暗物质线性依赖于暗物质的速度,甚至可能是运动学禁止,使这种情况下几乎不敏感的约束,从宇宙微波背景和矮星系的观测。因此,受阻的暗物质有可能在星系团或银河系中心产生可观测的信号,而在矮星中没有相应的信号。对于正质量分裂,我们发现,湮灭截面被抑制的小质量分裂,这有助于轻暗物质生存越来越严格的约束,从间接搜索。作为受阻暗物质的具体实现,我们介绍了一个隐藏的$SU(2)$扇区的矢量暗物质模型,和一个复合暗物质的情况下,基于QCD类暗扇区。

英文摘要:

We consider dark matter models in which the mass splitting between the dark matter particles and their annihilation products is tiny. Compared to the previously proposed Forbidden Dark Matter scenario, the mass splittings we consider are much smaller, and are allowed to be either positive or negative. To emphasize this modification, we dub our scenario "Impeded Dark Matter". We demonstrate that Impeded Dark Matter can be easily realized without requiring tuning of model parameters. For negative mass splitting, we demonstrate that the annihilation cross-section for Impeded Dark Matter depends linearly on the dark matter velocity or may even be kinematically forbidden, making this scenario almost insensitive to constraints from the cosmic microwave background and from observations of dwarf galaxies. Accordingly, it may be possible for Impeded Dark Matter to yield observable signals in clusters or the Galactic center, with no corresponding signal in dwarfs. For positive mass splitting, we show that the annihilation cross-section is suppressed by the small mass splitting, which helps light dark matter to survive increasingly stringent constraints from indirect searches. As specific realizations for Impeded Dark Matter, we introduce a model of vector dark matter from a hidden $SU(2)$ sector, and a composite dark matter scenario based on a QCD-like dark sector.

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