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arXiv 1504.07397gr-qcastro-ph.CO
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暗能量与暗物质相互作用的唯象模型

On phenomenological models of dark energy interacting with dark matter

Nicola Tamanini

摘要:

暗物质和暗能量之间的相互作用通常通过对物质守恒方程的唯象修正来引入,而爱因斯坦方程保持不变。从一些一般的和基本的考虑,在这项工作中,它表明,在黑暗的部门耦合很可能会引入新的条款,也在引力动力学。具体来说,在宇宙学背景方程的大体积耗散压力,表征粘性效应,并能够抑制在小尺度结构的形成,应该出现从暗耦合。在微扰的水平上,本文提出的分析揭示了从现象学角度正确定义暗区相互作用的困难。

英文摘要:

An interaction between dark matter and dark energy is usually introduced by a phenomenological modification of the matter conservation equations, while the Einstein equations are left unchanged. Starting from some general and fundamental considerations, in this work it is shown that a coupling in the dark sector is likely to introduce new terms also in the gravitational dynamics. Specifically in the cosmological background equations a bulk dissipative pressure, characterizing viscous effects and able to suppress structure formation at small scales, should appear from the dark coupling. At the level of the perturbations the analysis presented in this work reveals instead the difficulties in properly defining the dark sector interaction from a phenomenological perspective.

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。

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