由暗能量介导的暗区中的新相互作用
New interactions in the dark sector mediated by dark energy
摘要：
宇宙学观测揭示了一个暗物质扇区的存在，通常认为它只由一种粒子组成。然而，这个领域可能比我们目前认为的更复杂：可能有不止一种暗物质（例如冷暗物质的两种成分或热和冷暗物质的混合物），并且这些粒子之间可能存在新的相互作用。在本文中，我们研究了多个暗物质物种和相互作用介导的暗能量场的可能性。我们研究的背景和扰动演化在这些情况下。我们发现，背景演化的多个暗物质粒子系统（具有恒定的耦合）模仿一个单一的流体随时间变化的耦合参数。然而，在微扰层面上，这不再是真的。我们研究的情况下，吸引力和排斥力，以及冷和热的暗物质粒子的混合物。
英文摘要：
Cosmological observations have revealed the existence of a dark matter sector, which is commonly assumed to be made up of one particle species only. However, this sector might be more complicated than we currently believe: there might be more than one dark matter species (for example two components of cold dark matter or a mixture of hot and cold dark matter) and there may be new interactions between these particles. In this paper we study the possibility of multiple dark matter species and interactions mediated by a dark energy field. We study both the background and the perturbation evolution in these scenarios. We find that the background evolution of a system of multiple dark matter particles (with constant couplings) mimics a single fluid with a time-varying coupling parameter. However, this is no longer true on the perturbative level. We study the case of attractive and repulsive forces as well as a mixture of cold and hot dark matter particles.
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