论文标题
通过热化来提高冻结
Boosting Freeze-in through Thermalization
论文作者
论文摘要
如果可见扇区和黑暗扇区之间的相互作用速率永远不够强，则观察到的暗物质遗物丰度可能是通过非热过程在早期宇宙中产生的。这就是所谓的冻结机制中发生的。在最简单的Freeze-In范式中，在标准模型热浴中产生暗物质后，其丰度是冷冻的，并且保持恒定。但是，黑暗部门中的热化和数量变化的过程可能会产生强烈的影响，特别是增加了几个数量级的暗物质遗物丰度。在这里，我们表明，可以从一般参数作为能量和熵的保存来计算这种增强，独立于黑暗扇区的基本粒子物理细节。我们还注意到，该结果非常笼统，并且适用于FIMP的产生，独立于以紫外线为主导的紫外线。
If the interaction rates between the visible and the dark sectors were never strong enough, the observed dark matter relic abundance could have been produced in the early Universe by non-thermal processes. This is what occurs in the so-called freeze-in mechanism. In the simplest version of the freeze-in paradigm, after dark matter is produced from the standard model thermal bath, its abundance is frozen and remains constant. However, thermalization and number-changing processes in the dark sector can have strong impacts, in particular enhancing the dark matter relic abundance by several orders of magnitude. Here we show that this enhancement can be computed from general arguments as the conservation of energy and entropy, independently from the underlying particle physics details of the dark sector. We also note that this result is quite general, and applies to FIMP production independently of being UV- or IR-dominated.
