论文标题
中微子门户网站到flip污物与早期的时代
Neutrino Portal to FIMP Dark Matter with an Early Matter Era
论文作者
论文摘要
我们研究通过中微子门户的冻结大量粒子（FIMP）暗物质的冻结生产。我们认为一个隐藏的扇形由费米亚和一个复杂的标量组成，最轻的扇区被视为fi夫候选者。我们实施了I型SEESAW机制，以生成标准模型（SM）中微子的质量，并考虑三个重中微子，负责介导隐藏和SM扇区之间的相互作用。我们假设以物质为主时代（EMDE）发生在通货膨胀和大爆炸核合成之间的一段时间，这使得宇宙比标准辐射主导的时代更快地扩展。在这种情况下，从遗物密度约束中需要隐藏的和SM扇区很容易解耦，并且需要较大的Fimps和SM粒子之间的耦合。在这种情况下，我们在整个修改的宇宙历史中讨论了暗物质的动态，评估模型的相关约束，并讨论EMDE持续时间对暗物质生产的后果。最后，我们表明，如果重中微子不是热浴的一部分，则可以通过间接检测搜索来测试这种情况。
We study the freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter candidates through a neutrino portal. We consider a hidden sector comprised of a fermion and a complex scalar, with the lightest one regarded as a FIMP candidate. We implement the Type-I Seesaw mechanism for generating the masses of the Standard Model (SM) neutrinos and consider three heavy neutrinos, responsible for mediating the interactions between the hidden and the SM sectors. We assume that an early matter-dominated era (EMDE) took place for some period between inflation and Big Bang Nucleosynthesis, making the Universe to expand faster than in the standard radiation-dominated era. In this case, the hidden and SM sectors are easily decoupled and larger couplings between FIMPs and SM particles are needed from the relic density constraints. In this context, we discuss the dynamics of dark matter throughout the modified cosmic history, evaluate the relevant constraints of the model and discuss the consequences of the duration of the EMDE for the dark matter production. Finally, we show that if the heavy neutrinos are not part of the thermal bath, this scenario becomes testable through indirect detection searches.
