论文标题
顺序冷冻机制的暗物质丰度
Dark Matter Abundance from Sequential Freeze-in Mechanism
论文作者
论文摘要
我们对早期宇宙中暗物质生产的顺序冻结机制进行了详尽的分析。在这种机制中，暗物质遗物密度是由介体颗粒的八对消灭，这些介体颗粒本身是由标准模型颗粒的热碰撞产生的。低于调解器耦合到标准模型场的某些临界值，该顺序通道在通常的冻结中占主导地位，即即使介体不在热碰撞中，在热碰撞中直接产生了暗物质。后一种情况需要计算介体的全部非热分布，对于有限温度校正尤为重要。
We present a thorough analysis of the sequential freeze-in mechanism for dark matter production in the early universe. In this mechanism the dark matter relic density results from pair annihilation of mediator particles which are themselves produced by thermal collisions of standard model particles. Below some critical value of the mediator coupling to standard model fields, this sequential channel dominates over the usual freeze-in where dark matter is directly produced from thermal collisions, even when the mediator is not in thermal equilibrium. The latter case requires computing the full non-thermal distribution of the mediators, for which finite temperature corrections are particularly important.
