Stability of the Self-accelerating Universe in Massive Gravity
High Energy Physics - Theory
2015-06-16 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Abstract
We study linear perturbations around time dependent spherically symmetric solutions in the Lambda_3 massive gravity theory, which self-accelerate in the vacuum. We find that the dynamics of the scalar perturbations depend on the coordinate choice for the background solutions. For particular choices of coordinates there is a symmetry enhancement, leaving no propagating scalar degrees of freedom at linear order in perturbations. In contrast, any other coordinate choice propagates a single scalar mode. We find that the Hamiltonian of this scalar mode is unbounded from below for all self-accelerating solutions, signalling an instability.
Keywords
Cite
@article{arxiv.1305.4950,
title = {Stability of the Self-accelerating Universe in Massive Gravity},
author = {Nima Khosravi and Gustavo Niz and Kazuya Koyama and Gianmassimo Tasinato},
journal= {arXiv preprint arXiv:1305.4950},
year = {2015}
}
Comments
references added; accepted for publication in JCAP