论文标题
通过非最小耦合与重力产生暗物质
Dark matter production via a non-minimal coupling to gravity
论文作者
论文摘要
我们通过其非最小耦合与重力研究了发电后标量暗物质的产生。在充气振荡时期，对于足够大的非最小耦合$ξ\ gtrsim 5 $，产生暗物质。我们发现，对曲率和逆转效果的反馈通常对于$ 30 $的$ξ$的值很重要，这使生产效率的简单估计无效。在很大的耦合下，暗物质产量几乎独立于$ξ$，这表示在Aftraton-Dark物质系统中近似的准平衡。尽管在约旦框架中存在明显的负能量，分析变得复杂，但可以通过引入轻度的暗物质自我交互来正规化这种行为。使用晶格模拟，我们描述了导致正确暗物质遗物丰度的参数空间。
We study postinflationary scalar dark matter production via its non-minimal coupling to gravity. During the inflaton oscillation epoch, dark matter is produced resonantly for a sufficiently large non-minimal coupling $ξ\gtrsim 5$. We find that backreaction on the curvature and rescattering effects typically become important for the values of $ξ$ above $30$, which invalidate simple estimates of the production efficiency. At large couplings, the dark matter yield becomes almost independent of $ξ$, signifying approximate quasi-equilibrium in the inflaton-dark matter system. Although the analysis gets complicated by the presence of apparent negative energy in the Jordan frame, this behaviour can be regularized by introducing mild dark matter self-interaction. Using lattice simulations, we delineate parameter space leading to the correct dark matter relic abundance.
