Journal
PHYSICAL REVIEW D
Volume 88, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.88.024023
Keywords
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Funding
- World Premier International Research Center Initiative (WPI Initiative)
- MEXT, Japan
- U.S. Department of Energy
- NASA ATP Grant [NNX11AI95G]
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Economic Development and Innovation
- John Templeton Foundation
- [24540256]
- [21111006]
- Grants-in-Aid for Scientific Research [24540256, 21111006] Funding Source: KAKEN
- NASA [143925, NNX11AI95G] Funding Source: Federal RePORTER
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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.
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