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.

24 pages, 6 figures

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Cited by in corpus (65)

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• Massive Gravity
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• Nonlinear stability of cosmological solutions in massive gravity
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• Generalized quasi-dilaton theory
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• A new quasidilaton theory of massive gravity
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