Primordial Gravitational Waves in Bimetric Gravity
arXiv:1504.04969 · doi:10.1088/1475-7516/2015/09/015
Abstract
We study primordial tensor power-spectra generated during inflation in bimetric gravity. More precisely, we examine a homogeneous expanding spacetime in a minimal bimetric model with an inflaton and calculate tensor perturbations on the homogeneous background under slow-roll approximation. In terms of the mass eigenstates, only the power-spectrum of the massless state remains constant and both the power-spectrum of the massive state and the cross power-spectrum rapidly decay during inflation. The amplitude of the physical power-spectrum is suppressed due to the flavor mixing. All power-spectra in the flavor eigenstates coincide with each other up to the first order of the slow-roll parameter.
22 pages, references added, typos corrected
References in corpus (9)
- Resummation of Massive Gravity
- Massive gravity: nonlinear instability of the homogeneous and isotropic universe
- Stable and unstable cosmological models in bimetric massive gravity
- Anisotropic Friedmann-Robertson-Walker universe from nonlinear massive gravity
- Viable cosmology in bimetric theory
- Cosmological perturbations in massive bigravity
- Gravitational waves in bigravity cosmology
- A longitudinal component in massive gravitational waves arising from a bimetric theory of gravity
- Tensor Modes in Bigravity: Primordial to Present