论文标题
紫外线冻结与时间相关的流质衰减
Ultraviolet Freeze-in with a Time-dependent Inflaton Decay
论文作者
论文摘要
通常假定在重新加热充气衰减期间，以恒定的衰减宽度。但是，这是不能保证的，并且可以对暗物质（DM）起源产生强烈的影响。在紫外线（UV）冻结机制的背景下，如果连接黑暗和可见扇区的操作员具有足够高的质量尺寸，则大部分DM丰度是在重新加热后产生的。我们在这里研究了充气量时间依赖性衰减宽度对DM丰度的影响，强调了衰减是瞬时或恒定的情况的差异。我们还通过紫外线冻结（例如，从标准模型颗粒的2到2散射）或从通气量散射或衰减提供了混凝土示例，以阐明时间依赖性如何影响DM产量。
It is typically assumed that during reheating the inflaton decays with a constant decay width. However, this is not guaranteed and can have a strong impact on the dark matter (DM) genesis. In the context of the ultraviolet (UV) freeze-in mechanism, if the operators connecting the dark and visible sectors are of sufficiently high mass dimension, the bulk of the DM abundance is produced during and not after reheating. We study here the impact of a time-dependent decay width of the inflaton on the DM abundance, emphasizing the differences with respect to the cases where the decay is either instantaneous or constant. We also provide concrete examples for DM production via UV freeze-in, e.g., from 2-to-2 scatterings of standard model particles, or from inflaton scatterings or decays, elucidating how the time-dependence influences the DM yield.
