发表机构
International Centre for Theoretical Physics Asia-Pacific, University of Chinese Academy of Sciences（国际理论物理中心亚太分部，中国科学院大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出通过内轫致辐射建立暗物质与辐射的动力学平衡，实现SIMP暗物质冻结过程中的能量耗散，并在Sp(4)_c暗色模型中验证，也可推广至矢量暗物质模型。
AI 中文摘要
作为通过双体湮灭实现标准暗物质冻结的替代方案，强相互作用大质量粒子被提出通过三体/四体自湮灭来调节其遗迹丰度。在这种冻结过程中，暗物质必须同时经历数量减少和能量耗散。前者需要数减少过程，而后者则需要有效的能量耗散机制。在这项工作中，我们提出了一种新颖机制，其中内轫致辐射过程建立了暗物质与辐射之间的动力学平衡，从而耗散能量。更有吸引力的是，该机制可以在具有味普适夸克和轻轴子的一类强动力学模型中自然实现。为了在$Sp(4)_c$暗色模型中展示我们的结果，我们计算了所有相关的相互作用项，并数值求解了完整的玻尔兹曼方程。该机制同样可以应用于矢量暗物质模型。
英文摘要
As an alternative to standard dark matter freeze-out via two-body annihilation, strongly interacting massive particles are proposed to regulate their relic abundance through three/four-body self-annihilation. During such freeze-out, dark matter must undergo both number reduction and energy dissipation. The former requires number-reducing processes, and the latter requires an efficient energy-dissipation mechanism. In this work, we propose a novel mechanism where internal Bremsstrahlung processes establish kinetic equilibrium between dark matter and radiation, and thus dissipate energy. More appealingly, this mechanism can be naturally realized in a class of strong dynamics models with flavor-universal quarks and a light axion. To demonstrate our results in a $Sp(4)_c$ dark-color model, we compute all relevant interaction terms and numerically solve the full Boltzmann equations. The same mechanism can also be applied to vector dark matter models.
Comments6 pages, 3 figures
