arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2202.12906hep-ph
收藏

含时膨胀衰减的紫外冻结

Ultraviolet Freeze-in with a Time-dependent Inflaton Decay

Basabendu Barman, Nicolás Bernal, Yong Xu, Óscar Zapata

摘要:

通常假设在再加热期间,暴胀子以恒定的衰减宽度衰减。然而,这并不能保证,并可能对暗物质(DM)的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符具有足够高的质量尺寸,则DM丰度的大部分在重新加热期间而不是之后产生。我们在这里研究的膨胀的时间依赖性的衰减宽度的DM丰度的影响,强调的差异相对于衰减是瞬时的或恒定的情况下。我们还提供了通过UV冷冻生产DM的具体实例,例如,从标准模型粒子的2到2散射,或从暴胀子散射或衰变,阐明了时间依赖性如何影响DM产率。

英文摘要:

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.

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。

↑