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arXiv 2105.03429hep-ph
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黑暗QCD事项

Dark QCD Matters

Raghuveer Garani, Michele Redi, Andrea Tesi

摘要:

我们研究了由费米子的非阿贝尔规范理论组成的黑暗扇区的噩梦般的场景,引力耦合到标准模型(SM)。虽然测试这些场景是实验上的挑战,他们强烈的动机是暗重子和π介子的偶然稳定性,解释了宇宙学稳定性的暗物质(DM)。我们研究这些部门的生产,这是最低限度的人口通过重力冻结,导致暗部门的温度远低于SM,或通过暴胀衰变,或renormalizable相互作用产生温暖的DM。尽管只有引力耦合与SM这些方案原来是相当预测大致取决于三个参数:暗区温度,禁闭规模和暗π质量。特别是,当初始温度与SM相当时,这些情况非常受结构形成、$ΔN_{\rm eff}$和DM自相互作用的限制的约束。通常排除具有相同温度或比SM更热的暗扇区。

英文摘要:

We investigate the nightmare scenario of dark sectors that are made of non-abelian gauge theories with fermions, gravitationally coupled to the Standard Model (SM). While testing these scenarios is experimentally challenging, they are strongly motivated by the accidental stability of dark baryons and pions, that explain the cosmological stability of dark matter (DM). We study the production of these sectors which are minimally populated through gravitational freeze-in, leading to a dark sector temperature much lower than the SM, or through inflaton decay, or renormalizable interactions producing warmer DM. Despite having only gravitational couplings with the SM these scenarios turn out to be rather predictive depending roughly on three parameters: the dark sector temperature, the confinement scale and the dark pion mass. In particular, when the initial temperature is comparable to the SM one these scenarios are very constrained by structure formation, $ΔN_{\rm eff}$ and limits on DM self-interactions. Dark sectors with same temperature or warmer than SM are typically excluded.

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