标题： 惰性中微子暗物质在热浴中从标量衰变的产生 显示英文标题

标题： Sterile neutrino Dark Matter production from scalar decay in a thermal bath

摘要： 我们计算了在热等离子体中中性或带电标量场衰变时单态费米子的产生率。 我们发现当等离子体温度超过衰变标量的质量时，存在显著的热修正。 我们在衰变产物为相对论的情况下，给出了温度修正后的产生率的解析表达式。 我们还对非相对论衰变产物的情况进行了数值研究。 我们的结果可用于确定由标量衰变产生的暗物质粒子的丰度和动量分布。 包含热修正有助于改进对暗物质粒子自由流的影响的预测，这对测试给定模型与宇宙结构形成的兼容性至关重要。 经过一些修改，我们的结果可能推广到其他暗物质候选者在标量衰变中的产生情况。 显示英文摘要

摘要： We calculate the production rate of singlet fermions from the decay of neutral or charged scalar fields in a hot plasma. We find that there are considerable thermal corrections when the temperature of the plasma exceeds the mass of the decaying scalar. We give analytic expressions for the temperature-corrected production rates in the regime where the decay products are relativistic. We also study the regime of non-relativistic decay products numerically. Our results can be used to determine the abundance and momentum distribution of Dark Matter particles produced in scalar decays. The inclusion of thermal corrections helps to improve predictions for the free streaming of the Dark Matter particles, which is crucial to test the compatibility of a given model with cosmic structure formation. With some modifications, our results may be generalised to the production of other Dark Matter candidates in scalar decays.