Wednesday, April 3, 2013

1304.0449 (A. Emir Gumrukcuoglu et al.)

Cosmological Perturbations in Extended Massive Gravity    [PDF]

A. Emir Gumrukcuoglu, Kurt Hinterbichler, Chunshan Lin, Shinji Mukohyama, Mark Trodden
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.
View original: http://arxiv.org/abs/1304.0449

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