标题： 轻子直接和间接探测下的WIMPs再生 显示英文标题

标题： Regenerating WIMPs in the light of direct and indirect detection

摘要： 除了普通的冻结出局情景之外，还有几种方法可以解释暗物质的剩余密度。 例如，冻结进入机制可能构成一种替代方法，用于生成暗物质候选者的正确剩余密度，这些候选者的预测冻结出局丰度由于总湮灭截面较大而过低。 在这里，我们表明尽管这种机制可以解释为什么一个暗物质候选者具有正确的剩余密度，但某些候选者仍可能被排除，因为它们会导致矮椭球星系中产生大的伽马射线通量或在直接探测实验中产生大的弹性散射率。 为了研究这种情况，我们考察了MSSM中的中性子暗物质。 然而，我们的结论可以推广到其他类型的湮灭暗物质候选者，这些候选者在冻结出局情景中的剩余密度较低，但它们的剩余密度是由其他机制产生的。 显示英文摘要

摘要： There are several ways to explain the dark matter relic density other than by the ordinary freeze-out scenario. For example, the freeze-in mechanism may constitute an alternative for generating the correct relic density for dark matter candidates whose predicted freeze-out abundance is too low due to a large total annihilation cross section. Here we show that although such a mechanism could explain why a dark matter candidate has the correct relic density, some candidates may still be ruled out because they would lead to a large gamma ray flux in dwarf spheroidal galaxies or a large elastic scattering rate in direct detection experiments. To investigate this scenario we examine neutralino dark matter in the MSSM. However our conclusions can be generalised to other types of annihilating DM candidates with a low relic density in the freeze-out scenario but which have their relic densities generated by some other mechanism.