论文标题
通过冻结产生的fi脚暗物质上的较低质量界限
Lower Mass Bounds on FIMP Dark Matter Produced via Freeze-In
论文作者
论文摘要
微弱的相互作用的巨大颗粒（FIMP）是候选暗物质的候选者，在早期宇宙中从未热过，并且其生产是通过腐烂和/或热浴颗粒的散射进行的。如果Fimps与热浴的相互作用是可重新分配的，这种情况称为Freeze-In，在浴缸质量周围的温度下，生产最有效，并且在高温下对未知物理不敏感。我们以独立于模型的方式工作，我们考虑了三种不同的生产机制：两体衰减，三体衰减和二进制碰撞。我们计算FIMP相空间的分布和物质功率谱，并研究了小尺度上宇宙学结构的抑制。我们的结果是fi质质量的下限。最后，我们研究了如何在FIMP提供次主导的暗物质成分的情况下放松这些约束。
Feebly Interacting Massive Particles (FIMPs) are dark matter candidates that never thermalize in the early universe and whose production takes place via decays and/or scatterings of thermal bath particles. If FIMPs interactions with the thermal bath are renormalizable, a scenario which is known as freeze-in, production is most efficient at temperatures around the mass of the bath particles and insensitive to unknown physics at high temperatures. Working in a model-independent fashion, we consider three different production mechanisms: two-body decays, three-body decays, and binary collisions. We compute the FIMP phase space distribution and matter power spectrum, and we investigate the suppression of cosmological structures at small scales. Our results are lower bounds on the FIMP mass. Finally, we study how to relax these constraints in scenarios where FIMPs provide a sub-dominant dark matter component.
