We study for the first time the case in which Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the standard model particles in an extra-dimensional Randall-Sundrum scenario. We assume that both the dark matter and the standard model are localized in the IR-brane and only interact via gravitational mediators, namely the graviton, the Kaluza-Klein gravitons and the radion. We found that in the early Universe DM could be generated via two main processes: the direct freeze-in and the sequential freeze-in. The regions where the observed DM relic abundance is produced are largely compatible with cosmological and collider bounds.

中文翻译：

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扭曲的额外维度中的 Kaluza-Klein FIMP 暗物质

我们首次研究了暗物质 (DM) 由弱相互作用大质量粒子 (FIMP) 组成的情况，这些粒子在超维 Randall-Sundrum 场景中仅与标准模型粒子在重力作用下相互作用。我们假设暗物质和标准模型都位于红外膜中，并且仅通过引力介质相互作用，即引力子、Kaluza-Klein 引力子和无线电子。我们发现，在早期宇宙中，DM 可以通过两个主要过程产生：直接冻结和顺序冻结。产生观察到的 DM 遗迹丰度的区域在很大程度上与宇宙学和对撞机边界兼容。