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arXiv 1609.02555hep-phastro-ph.CO
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来自高度退耦扇区的热暗物质

Thermal Dark Matter From A Highly Decoupled Sector

Asher Berlin, Dan Hooper, Gordan Krnjaic

摘要:

最近的研究表明,如果暗物质与一个与标准模型高度解耦的扇区处于热平衡状态,那么即使暗物质重至1-100 PeV,它也可以以可接受的残余丰度冻结出来。在这种情况下,暗区和可见区都是在膨胀后填充的,但具有独立的温度。暗区中最轻的粒子通常寿命很长,并且可以支配宇宙的能量密度。在衰变时,这些粒子可以显著地重新加热可见部分,稀释暗物质的丰度,从而允许比传统WIMP重得多的暗物质粒子。在本文中,我们提出了一个系统的和教学的治疗宇宙学的历史,在这一类的模型,强调最简单的情况下,一个暗物质候选人湮灭成隐藏的部门粒子,然后通过矢量,希格斯,或轻子门户网站衰减成可见物质。在每一种情况下,我们发现足够的参数空间,非常重的暗物质粒子可以提供一个可接受的热遗迹丰度。我们还讨论了具有这些动态的模型可能的扩展。

英文摘要:

It has recently been shown that if the dark matter is in thermal equilibrium with a sector that is highly decoupled from the Standard Model, it can freeze-out with an acceptable relic abundance, even if the dark matter is as heavy as ~1-100 PeV. In such scenarios, both the dark and visible sectors are populated after inflation, but with independent temperatures. The lightest particle in the dark sector will be generically long-lived, and can come to dominate the energy density of the universe. Upon decaying, these particles can significantly reheat the visible sector, diluting the abundance of dark matter and thus allowing for dark matter particles that are much heavier than conventional WIMPs. In this paper, we present a systematic and pedagogical treatment of the cosmological history in this class of models, emphasizing the simplest scenarios in which a dark matter candidate annihilates into hidden sector particles which then decay into visible matter through the vector, Higgs, or lepton portals. In each case, we find ample parameter space in which very heavy dark matter particles can provide an acceptable thermal relic abundance. We also discuss possible extensions of models featuring these dynamics.

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