Scalar perturbations through cycles
Scalar perturbations through cycles
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DOI：
10.1103/physrevd.86.083510
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发表时间：
2012-01
影响因子：
5
通讯作者：
Zhi-Guo Liu;Yun-song Piao
中科院分区：
文献类型：
--
作者：
Zhi-Guo Liu;Yun-song Piao
本文用解析方法和数值方法研究了标量扰动在非奇异弹跳循环中的演化。在大尺度上曲率摄动的幅值会被一个周期一个周期地放大，等曲率摄动也会被放大，但其放大的速度比曲率摄动慢，除非它与度规摄动的耦合是不可忽略的。
We analytically and numerically investigate the evolutions of the scalar perturbations through the cycles with nonsingular bounce. It is found that the amplitude of the curvature perturbation on large scale will be amplified cycle by cycle, and the isocurvature perturbations also obtain an amplification, but the rate of its amplification is slower than that of curvature perturbation, unless its coupling to the metric perturbation is not negligible.