Dark sectors with purely gravitational couplings to the Standard Model are unavoidably populated from the SM plasma by graviton exchange, and naturally provide dark matter candidates. We examine the production in the relativistic regime where the dark sector is approximately scale invariant, providing general analytical formulas that depend solely on the central charge of the dark sector. We then assess the relevance of interactions that can lead to a variety of phenomena including thermalisation, non-perturbative mass gaps, out-of-equilibrium phase transitions and cannibalism in the dark sector. As an illustrative example we consider the dark glueball scenario in this light and show it to be a viable dark matter candidate due to the suppression of gravitational production. We go on to extend these results to strongly coupled CFTs and their holographic duals at large-N with the dark dilaton as the dark matter candidate.

通过引力子交换不可避免地从SM等离子体中填充了与标准模型具有纯重力耦合的暗区，并且自然地提供了暗物质候选对象。我们在相对论政权中考察了暗区大约是尺度不变的相对论生产，提供了仅取决于暗区中心电荷的一般分析公式。然后，我们评估相互作用的相关性，这些相互作用可能导致多种现象，包括热化，非扰动质量间隙，不平衡的相变和暗区的自相残杀。作为说明性示例，我们从这种角度考虑了暗胶球场景，并显示出由于抑制了重力产生，它是可行的暗物质候选者。N以暗膨胀子为暗物质候选者。