标题： 热暗物质和非热暗物质与引力中微子再加热 显示英文标题

标题： Thermal and nonthermal dark matters with gravitational neutrino reheating

摘要： 我们详细讨论了如何仅通过引力相互作用产生的中微子成功加热宇宙。 为此，我们引入了众所周知的I型跷跷板中微子模型。 根据跷跷板模型参数，实现了两种不同的再加热历史，分别称为i) 中微子主导：在暴胀子主导之后，宇宙变为中微子主导，随后它们的衰变结束再加热过程，ii) 中微子加热：尽管相比暴胀子能量处于次主导地位，中微子能有效加热热浴并产生辐射主导的宇宙。 施加重子不对称产率，在考虑原初引力波（PGW）的BBN（大爆炸核合成）$\Delta N_{\rm eff}$约束下，我们得出了再加热状态方程的约束应位于$0.5\lesssim w_\phi\lesssim1.0$之内。 在这些由中微子驱动的再加热背景下，我们进一步对暗物质（DM）的热和非热产生进行了详细分析，采用了两个最小模型，即希格斯门户暗物质和经典QCD伪标量轴子。 当各种直接和间接观测进行对比时，看似不相关的DM和I型跷跷板参数之间出现了一个有趣的关联。 当DM在再加热期间被冻结进入、冻结退出或振荡时，新的参数空间被打开，这可能在未来的实验中被探测到，为在实验室中研究早期宇宙提供了一种间接途径。 显示英文摘要

摘要： We have discussed in detail how neutrinos produced from inflaton solely through gravitational interaction can successfully reheat the universe. For this, we have introduced the well-known Type-I seesaw neutrino model. Depending on seesaw model parameters, two distinct reheating histories have been realized and dubbed as i) Neutrino dominating: Following the inflaton domination, the universe becomes neutrino dominated, and their subsequent decay concludes the reheating process, and ii) Neutrino heating: Despite being sub-dominant compared to inflaton energy, neutrinos efficiently heat the thermal bath and produce the radiation dominated universe. Imposing baryon asymmetric yield, the $\Delta N_{\rm eff}$ constraint at Big Bang Nucleosynthesis (BBN) considering primordial gravitational waves (PGW), we have arrived at the following constraints on reheating equation of state to lie within $0.5\lesssim w_\phi\lesssim1.0$. In these neutrino-driven reheating backgrounds, we further performed a detailed analysis of both thermal and non-thermal production of dark matter (DM), invoking two minimal models, namely the Higgs portal DM and classical QCD pseudo scalar axion. An interesting correlation between seemingly uncorrelated DM and Type-I seesaw parameters has emerged when confronting various direct and indirect observations. When DMs are set to freeze-in, freeze-out, or oscillate during reheating, new parameter spaces open, which could be potentially detectable in future experiments, paving an indirect way to look into the early universe in the laboratory.