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
影响因子:
4.4
通讯作者:
Wang, Bin
中科院分区:
文献类型:
--
作者:
He, Jian-Hua;Abdalla, Elcio;Wang, Bin
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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