论文标题
部分可观测时空混沌系统的无模型预测
Fingerprints of freeze-in dark matter in an early matter-dominated era
论文作者
论文摘要
我们研究了替代宇宙学历史的影响，并以早期主导的时期对暗物质的冻结产生产生。这种早期物质的统治是由元素稳定物质场耗散成辐射而触发的。通常，耗散率具有非平凡的温度和尺度因子依赖性。与通常通过辐射主导的宇宙中的冻结机制进行暗物质生产的情况相比，在这种情况下，可以容纳可见的和黑暗扇区之间较大的数量级。最后，作为原理的证明，我们考虑了一个特定模型，其中暗物质是通过与标准模型光子具有动力学混合的子GEV暗光子产生的。我们指出，在存在早期物质主导的时代的情况下，实验可以探测该模型的参数空间。
We study the impact of an alternate cosmological history with an early matter-dominated epoch on the freeze-in production of dark matter. Such early matter domination is triggered by a meta-stable matter field dissipating into radiation. In general, the dissipation rate has a non-trivial temperature and scale factor dependence. Compared to the usual case of dark matter production via the freeze-in mechanism in a radiation-dominated universe, in this scenario, orders of magnitude larger coupling between the visible and the dark sector can be accommodated. Finally, as a proof of principle, we consider a specific model where the dark matter is produced by a sub-GeV dark photon having a kinetic mixing with the Standard Model photon. We point out that the parameter space of this model can be probed by the experiments in the presence of an early matter-dominated era.
