Stability of the curvature perturbation in dark sectors' mutual interacting models

Stability of the curvature perturbation in dark sectors' mutual interacting models
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暗区相互作用模型中曲率扰动的稳定性

DOI:
10.1016/j.physletb.2008.11.062
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发表时间:
2008-07
期刊:
影响因子:
4.4
通讯作者:
Wang, Bin
Wang, Bin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
He, Jian-Hua;Abdalla, Elcio;Wang, Bin

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我们考虑在暗能量和暗物质之间有小耦合的宇宙学模型中的扰动。我们证明了曲率扰动的稳定性取决于暗扇区之间的耦合类型。当暗能量为精粹型时,如果耦合与暗物质能量密度成正比,则会驱动曲率扰动的不稳定性;而如果耦合与暗能量密度成正比,则曲率扰动的稳定性还有空间。当暗能量是幻影型时,扰动总是稳定的,无论耦合是否与一个或另一个能量密度成正比。
We consider perturbations in a cosmological model with a small coupling between dark energy and dark matter. We prove that the stability of the curvature perturbation depends on the type of coupling between dark sectors. When the dark energy is of quintessence type, if the coupling is proportional to the dark matter energy density, it will drive the instability in the curvature perturbations; however if the coupling is proportional to the energy density of dark energy, there is room for the stability in the curvature perturbations. When the dark energy is of phantom type, the perturbations are always stable, no matter whether the coupling is proportional to the one or the other energy density.
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