Cosmological Perturbations in Extended Massive Gravity
Cosmological Perturbations in Extended Massive Gravity
复制标题
扩展质量引力中的宇宙扰动
DOI：
10.1103/physrevd.88.024023
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Trodden
中科院分区：
文献类型：
--
作者：
A. E. Gumrukcuoglu;K. Hinterbichler;C. Lin;S. Mukohyama;M. Trodden
本文研究了非线性质量引力的两种扩展：准介子理论和变质量理论的自加速解周围的宇宙学扰动。我们研究宇宙学的解决方案的稳定性，并在多大程度上消失的标量和矢量扰动的自加速解决方案在大质量引力的动力学项是通用的理论扩展时。我们发现，这些动力学项一般都是非零的两个扩展，虽然有限制的参数和背景演变要求他们有正确的符号。特别地，准声子理论的自加速解对于波长小于哈勃长度的标量扰动总是不稳定的。
We study cosmological perturbations around self-accelerating solutions to two extensions of nonlinear massive gravity: the quasi-dilaton theory and the mass-varying theory. We examine stability of the cosmological solutions, and the extent to which the vanishing of the kinetic terms for scalar and vector perturbations of self-accelerating solutions in massive gravity is generic when the theory is extended. We find that these kinetic terms are in general nonvanishing in both extensions, though there are constraints on the parameters and background evolution from demanding that they have the correct sign. In particular, the self-accelerating solutions of the quasi-dilaton theory are always unstable to scalar perturbations with wavelength shorter than the Hubble length.