arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2404.07313astro-ph.CO
收藏

动力学摩擦对演化暗能量扰动的影响

Effects of dynamical friction on perturbations for evolving dark energy

Francesco Pace, Orlando Luongo, Antonino Del Popolo

备注：
18 pages, 11 figures. It matches the version published on PDU
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

AI总结：

本研究探究动力学摩擦对演化暗能量扰动的影响，分析两类摩擦模型在线性及非线性扰动下的效应，发现耗散压强摩擦会显著减慢扰动演化，并指出其在大尺度上的可探测偏差区域。

摘要：

我们探究了在线性增长因子和球对称坍缩模型适用的尺度上，动力学摩擦的影响，并展示了其对扰动演化的作用。具体而言，考虑平滑和成团暗能量模型，我们选取两种主要层级模型来描述摩擦的作用：第一种模型的摩擦项与哈勃率成正比，第二种模型的摩擦由暗能量压强诱导。第二种方法是对第一种的推广，体现了压强是一种广义相对论效应的观点，解释了为何在考虑正压暗能量流体时可能会产生摩擦。我们利用球对称坍缩模型的形式体系，在线性和非线性扰动层面研究了摩擦的相应效应。动力学摩擦的效应非常微弱，因此无法先验排除它，而耗散压强摩擦则会导致扰动演化显著减慢。这一点尤其可以从暗物质晕质量函数中推断出来，我们还针对该质量函数引入了暗能量成团带来的修正。为此，为了辨别与标准宇宙学模型的可探测偏差，我们明确了耗散效应在大尺度上可能发挥重要作用的区域。

英文摘要：

We explore the impact of dynamical friction on scales where the linear growth factor and the spherical collapse model can be applied and show its influence on the evolution of perturbations. In particular, considering smooth and clustering dark energy models, we describe the role played by friction by selecting two main hierarchical models, i.e., the first where the friction term is proportional to the Hubble rate, whereas the second where friction is induced by the dark energy pressure. The second approach generalises the first and translates the idea that pressure is a general relativistic effect, motivating why friction might arise once barotropic dark energy fluids are considered. The corresponding effects of friction are investigated at the level of linear and nonlinear perturbations, using the formalism of the spherical collapse model. Whilst dynamical friction has very small effects and thus it cannot be excluded a priori, dissipative pressure friction leads to a substantial slow down in the evolution of perturbations. This can be inferred particularly from the halo mass function, for which we also employ corrections due to dark energy clustering. To this end, in order to discern detectable deviations from the standard cosmological model, we thus highlight where dissipation effects might play a significant role at large scales.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑