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arXiv 1602.08490hep-phastro-ph.CO
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PeV-Scale作为退耦扇区热遗迹的暗物质

PeV-Scale Dark Matter as a Thermal Relic of a Decoupled Sector

Asher Berlin, Dan Hooper, Gordan Krnjaic

摘要:

在这封信中,我们考虑了一类场景,其中暗物质是一个沉重的隐藏部门的一部分,是热解耦的标准模型在早期宇宙。暗物质通过湮灭到更轻的亚稳态而冻结,其随后的丰度可以自然地支配宇宙的能量密度。当这种状态衰变时,它会重新加热可见部分并稀释所有残余丰度,从而使暗物质比弱尺度重几个数量级。为了具体起见,我们考虑一个简单的实现与狄拉克费米子暗物质候选人耦合到一个大质量的规范玻色子,通过其动力学混合超荷衰变到标准模型。我们确定可行的参数空间中的暗物质可以作为重~1-100 PeV,而不会在早期宇宙过度生产。

英文摘要:

In this letter, we consider a class of scenarios in which the dark matter is part of a heavy hidden sector that is thermally decoupled from the Standard Model in the early universe. The dark matter freezes-out by annihilating to a lighter, metastable state, whose subsequent abundance can naturally come to dominate the energy density of the universe. When this state decays, it reheats the visible sector and dilutes all relic abundances, thereby allowing the dark matter to be orders of magnitude heavier than the weak scale. For concreteness, we consider a simple realization with a Dirac fermion dark matter candidate coupled to a massive gauge boson that decays to the Standard Model through its kinetic mixing with hypercharge. We identify viable parameter space in which the dark matter can be as heavy as ~1-100 PeV without being overproduced in the early universe.

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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