论文标题
两个阶段加热：CMB对充气和暗物质现象学的约束
Two phase reheating: CMB constraints on inflaton and dark matter phenomenology
论文作者
论文摘要
我们提出了一个两阶段的加热方案，其中最初的预热动力学由有效的动力学描述，然后是标准扰动加热。在预热过程中，晶格模拟的一些重要的通用结果被认为是我们两相动力学中的关键输入。在此框架中，已经在带有加热场的充气耦合上获得了详细的现象学约束，并且在CMB约束通货膨胀标量光谱指数方面，暗物质参数。据观察，常规的再加热方案通常可以预测最大重新加热温度$ t_ {re}^{max} \ simeq 10^{15} $ gev，对应于从通货膨胀结束到辐射统治的几乎瞬时过渡。这一事实自然会导致非扰动加拉顿衰减的问题，这与扰动的重新加热直接冲突。考虑到这一点，通过将有效的非扰动动力学纳入初始阶段，我们的两相加热场景的模型还可以预测与模型无关的最大加热温度，这与瞬时过程无关。此外，如果在$（10^{13}，10^{10}）$ GEV内预测$ t_ {re}^{max} $，如果CMB在具有不同重新加热字段的Efteraton耦合上的约束，则考虑到CMB的约束。我们以模型的方式进一步详细研究了暗物质现象学，并展示了如何通过Actraton光谱指数通过CMB参数来限制暗物质参数空间。考虑到通过冷冻机制加热过程中的暗物质产生，已经观察到其参数空间受到我们的两相加热的高度约束，而不是传统的再加热场景所预测的约束，这被认为是理论上不完整的。
We propose a two-phase reheating scenario where the initial preheating dynamics is described by an effective dynamics followed by the standard perturbative reheating. Some of the important universal results of lattice simulation during preheating have been considered as crucial inputs in our two-phase dynamics. In this framework, detailed phenomenological constraints have been obtained on the inflaton couplings with reheating fields, and dark matter parameters in terms of CMB constrained inflationary scalar spectral index. It is observed that the conventional reheating scenario generically predicts the maximum reheating temperature $T_{re}^{max} \simeq 10^{15}$ GeV, corresponding to an almost instantaneous transition from the end of inflation to radiation domination. This fact will naturally lead to the problem of non-perturbative inflaton decay, which is in direct conflict with the perturbative reheating itself. Taking into account this by incorporating effective non-perturbative dynamics as the initial phase, our model of two-phase reheating scenarios also predicts model-independent maximum reheating temperature, which does not correspond to the instantaneous process. Further, $T_{re}^{max}$ is predicted to lie within $(10^{13}, 10^{10})$ GeV if CMB constraints on inflaton couplings with different reheating field are taken into account. We have further studied in detail the dark matter phenomenology in a model-independent manner and show how dark matter parameter space can be constrained through CMB parameters via the inflaton spectral index. Considering dark matter production during reheating via the Freeze-in mechanism, its parameter space has been observed to be highly constrained by our two-phase reheating than the constraints predicted by the conventional reheating scenarios, which are believed to theoretically incomplete.
