标题： 标量场暗物质具有随时间变化的状态方程 显示英文标题

标题： Scalar field dark matter with time-varying equation of state

摘要： 我们提出了一种新的标量场暗物质与暗能量相互作用的模型。采用快速振荡情况下暗物质场的流体描述，我们发现暗物质的状态方程非零，甚至在暗能量主导时期晚期变得越来越负。此外，暗物质在所有尺度上的声速均非零，并且出现非绝热压力贡献。结果表明，暗物质内部仍存在尚未探索的可能相互作用，这些相互作用会导致新的背景效应，并可能影响结构形成过程。 显示英文摘要

摘要： We propose a new model of scalar field dark matter interacting with dark energy. Adopting a fluid description of the dark matter field in the regime of rapid oscillations, we find that the equation of state for dark matter is non-zero and even becomes increasingly negative at late times during dark energy domination. Furthermore, the speed of sound of dark matter is non-vanishing at all length scales, and a non-adiabatic pressure contribution arises. The results indicate that there are still unexplored possible interactions within the dark sector that lead to novel background effects and can impact structure formation processes.