增强NO型号中的紫外线冻结
Boosting Ultraviolet Freeze-in in NO Models
摘要：
我们提出了一种新的UV冻结机制，以提高宇宙学中的暗物质丰度，其中膨胀之后是一个由比辐射更硬的流体主导的时代。在这样的情况下，即使是很小的辐射丰度，例如由瞬时预热效应产生的，最终也将主导宇宙的总能量密度，而不需要完全的暴胀子衰变。为了具体起见，我们集中在非振荡（NO）典型的通货膨胀模型，虽然我们的治疗是相当普遍的，可以扩展到其他情况。初始热浴的高温以及随后没有熵注入到标准模型等离子体中转化为高效的UV DM冻结。特别是，我们发现，在kination，DM丰度的增强一般获得任何生产截面不随温度降低。
英文摘要：
We present a novel UV freeze-in mechanism for enhancing the dark matter abundance in cosmologies where inflation is followed by an epoch dominated by a fluid stiffer than radiation. In such scenarios, even a small radiation abundance, produced for instance by instantaneous preheating effects, will eventually dominate the total energy density of the Universe without the need for a complete inflaton decay. For the sake of concreteness, we focus in non-oscillatory (NO) quintessential inflation models, albeit our treatment is rather general and can be extended to other scenarios. The high temperature of the initial thermal bath together with the absence of subsequent entropy injections into the Standard Model plasma translates into a highly-effective UV DM freeze-in. In particular, we find that, during kination, an enhancement in the DM abundance is generically obtained for any production cross-section not-decreasing with temperature.
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