Cosmological perturbations in k-essence model
Cosmological perturbations in k-essence model
复制标题
k-essence 模型中的宇宙扰动
DOI：
10.1103/physrevd.85.084026
复制
发表时间：
2012
影响因子：
5
通讯作者：
K. Bamba
中科院分区：
文献类型：
--
作者：
久野義人;鈴木啓太;一瀬郁夫;K. Bamba
亚视界近似是宇宙学微扰论中常用的近似方法。然而，在本文中，它表明，subhorizon近似并不总是一个很好的近似，至少在本质模型的情况下。我们还表明，由本质模型给出的声速对物质密度扰动的时间演化产生了巨大的影响，未来的观测可以澄清模型和本质模型之间的差异。
Subhorizon approximation is often used in cosmological perturbation theory. In this paper, however, it is shown that the subhorizon approximation is not always a good approximation at least in the case of the-essence model. We also show that the sound speed given by the-essence model exerts a huge influence on the time evolution of the matter density perturbation, and future observations could clarify the differences between themodel and the-essence model.