论文标题
暗物质在QCD禁闭的早期宇宙学期间冻结
Dark Matter Freeze Out during an Early Cosmological Period of QCD Confinement
论文作者
论文摘要
标准知识指出，需要适应弱相互作用的大量粒子的遗物密度与直接搜索暗物质之间存在张力。然而，对遗物密度的估计取决于早期宇宙的宇宙学到冻结时代的宇宙学，而不是观察到的。我们探索了一种非标准的宇宙学，在早期的宇宙中，强耦合不断变化，在冻结时触发了早期的QCD限制。我们发现，根据暗物质与标准模型之间相互作用的性质，在限制的早期期间冻结可能会导致对遗物密度的期望截然不同，从而使参数空间的区域实现了正确的丰度，否则可以通过直接搜索来排除。
Standard lore states that there is tension between the need to accommodate the relic density of a weakly interacting massive particle and direct searches for dark matter. However, the estimation of the relic density rests on an extrapolation of the cosmology of the early Universe to the time of freeze out, untethered by observations. We explore a nonstandard cosmology in which the strong coupling constant evolves in the early Universe, triggering an early period of QCD confinement at the time of freeze out. We find that depending on the nature of the interactions between the dark matter and the Standard Model, freeze out during an early period of confinement can lead to drastically different expectations for the relic density, allowing for regions of parameter space which realize the correct abundance but would otherwise be excluded by direct searches.
