论文标题
Sommerfeld增强的不对称暗物质的遗物密度
Relic Density of Asymmetric Dark Matter with Sommerfeld enhancement
论文作者
论文摘要
当Sommerfeld的增强增强化学上的歼灭速率时，我们研究了不对称热暗物质的丰度演变。然后，当相互作用速率取决于速度时，我们讨论动力学脱钩对不对称暗物质的遗物丰度的影响。通常，在化学脱钩的框架中分析了不对称暗物质的遗物密度。实际上，在与化学平衡脱钩之后，不对称的暗物质颗粒和抗粒子在动力学平衡中仍存在一段时间。由于在这种情况下没有温度依赖性，因此它对$ s $波浪歼灭没有影响。但是，动力学的去耦对$ p- $ wave歼灭的情况产生了影响，而索默菲尔德（Sommerfeld）增强了$ s- $和$ p-$ wave an灭。我们在哪个程度上研究了动力学的脱钩影响不对称暗物质粒子和抗颗粒的遗物丰富性。我们通过使用暗物质遗物密度的观察数据在横截面和不对称因子上发现了约束。
We investigate the evolution of abundance of the asymmetric thermal Dark Matter when its annihilation rate at chemical decoupling is boosted by the Sommerfeld enhancement. Then we discuss the effect of kinetic decoupling on relic abundance of asymmetric Dark Matter when the interaction rate depends on the velocity. Usually the relic density of asymmetric Dark Matter is analyzed in the frame of chemical decoupling. Indeed after decoupling from the chemical equilibrium, asymmetric Dark Matter particles and anti--particles were still in kinetic equilibrium for a while. It has no effect on the case of $s-$wave annihilation since there is no temperature dependence in this case. However, the kinetic decoupling has impacts for the case of $p-$wave annihilation and Sommerfeld enhanced $s-$ and $p-$wave annihilations. We investigate in which extent the kinetic decoupling affects the relic abundances of asymmetric Dark Matter particle and anti--particle in detail. We found the constraints on the cross section and asymmetry factor by using the observational data of relic density of Dark Matter.
