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arXiv 2402.04743hep-phastro-ph.CO
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早期宇宙中的温度演化与强耦合下的freeze-in机制

Temperature evolution in the Early Universe and freeze-in at stronger coupling

Catarina Cosme, Francesco Costa, Oleg Lebedev

AI总结:

本研究探讨早期宇宙中强耦合暗物质freeze-in机制,在紫外完备框架下分析SM热浴最高温度的作用,指出暴胀子衰变为右手中微子的场景可实现该机制且再加热前SM温度恒定,为暗物质探测提供新方向。

摘要:

当标准模型(SM)热浴的温度从未超过暗物质质量时,强耦合下的暗物质freeze-in(冻结产生)机制便会生效。该方案的一个吸引人的特点是,它既能通过直接探测实验开展研究,也可在大型强子对撞机(LHC)上进行验证。在本研究中,我们展示了该机制如何在一个简单的紫外(UV)完备框架中实现,重点强调了SM热浴最高温度所起的作用。我们证明,该最高温度可与再加热温度重合,或与之接近,从而使暗物质的产生始终受到玻尔兹曼抑制。例如,若暴胀子主要衰变为相互作用极弱的右手中微子,再由后者生成SM热浴,这种情况便会实现。在此情形下,SM sector的温度在再加热之前的宇宙学时期内保持恒定。

英文摘要:

Dark matter freeze-in at stronger coupling is operative when the Standard Model (SM) bath temperature never exceeds the dark matter mass. An attractive feature of this scenario is that it can be probed by direct detection experiments as well as at the LHC. In this work, we show how the mechanism can be realized in a simple UV complete framework, emphasizing the role of the maximal temperature of the SM thermal bath. We demonstrate that the maximal temperature can coincide with the reheating temperature or be close to it such that dark matter production is always Boltzmann-suppressed. This possibility is realized, for example, if the inflaton decays primarily into feebly interacting right-handed neutrinos, which subsequently generate the SM thermal bath. In this case, the SM sector temperature remains constant over cosmological times prior to reheating.

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