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耦合暗能量模型中的宇宙学扰动

Cosmological Perturbations in Models of Coupled Dark Energy

Sirichai Chongchitnan

备注：
15 pages, 7 figures. Published in Phys. Rev. D
发表信息：
Phys.Rev.D79:043522,2009
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摘要：

在文献中已经提出了暗能量与暗物质相互作用的模型，以帮助解释为什么暗能量应该只是在最近才占主导地位。本文提出了一个计算具有一般质量势和相互作用项的宇宙学扰动的动力学框架。我们的形式主义是建立在强大的相空间的方法，经常用来分析的动力学吸引子的背景。我们得到一组耦合的微分方程纯粹的无量纲，有界变量，并应用这些方程来计算扰动在一些情况下。有趣的是，在存在暗扇区相互作用的情况下，我们发现暗能量扰动在后期不会红移，但即使在小尺度上也可以聚集。我们还澄清了初始条件的扰动在黑暗的部门，表明绝热不再是保守的存在下的黑暗部门的相互作用，即使在大尺度上。文中还讨论了扰动不稳定性的一些问题。

英文摘要：

Models in which dark energy interacts with dark matter have been proposed in the literature to help explain why dark energy should only come to dominate in recent times. In this paper, we present a dynamical framework to calculate cosmological perturbations for a general quintessence potential and interaction term. Our formalism is built upon the powerful phase-space approach often used to analyse the dynamical attractors in the background. We obtain a set of coupled differential equations purely in terms of dimensionless, bounded variables and apply these equations to calculate perturbations in a number of scenarios. Interestingly, in the presence of dark-sector interactions, we find that dark energy perturbations do not redshift away at late times, but can cluster even on small scales. We also clarify the initial conditions for the perturbations in the dark sector, showing that adiabaticity is no longer conserved in the presence of dark-sector interactions, even on large scales. Some issues of instability in the perturbations are also discussed.

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