论文标题
在无模型中提高紫外线冻结
Boosting Ultraviolet Freeze-in in NO Models
论文作者
论文摘要
我们提出了一种新型的紫外线冻结机制，用于增强宇宙学中的暗物质丰度，在宇宙学中，膨胀之后是由液体僵硬主导的时期，而不是辐射。在这种情况下，即使是通过瞬时预热效应产生的小辐射丰度，最终将主导宇宙的总能量密度，而无需完全衰变。为了具体，我们将重点放在非振荡（NO）典型通货膨胀模型上，尽管我们的治疗方法相当一般，并且可以扩展到其他情况。初始热浴的高温以及随后的熵注射到标准模型等离子体中的不足，可以转化为高效的UV DM Freeze-In。特别是，我们发现在Kination期间，对于任何生产横截面，与温度不持续的任何生产的横截面都可以增强DM丰度的增强。
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.
