Cosmological Perturbations in Extended Massive Gravity
Abstract
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 non-vanishing 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.
Cite
@article{arxiv.1304.0449,
title = {Cosmological Perturbations in Extended Massive Gravity},
author = {A. Emir Gumrukcuoglu and Kurt Hinterbichler and Chunshan Lin and Shinji Mukohyama and Mark Trodden},
journal= {arXiv preprint arXiv:1304.0449},
year = {2013}
}
Comments
24 pages, 6 figures