A general theory of linear cosmological perturbations: bimetric theories
General Relativity and Quantum Cosmology
2017-01-27 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
We implement the method developed in [1] to construct the most general parametrised action for linear cosmological perturbations of bimetric theories of gravity. Specifically, we consider perturbations around a homogeneous and isotropic background, and identify the complete form of the action invariant under diffeomorphism transformations, as well as the number of free parameters characterising this cosmological class of theories. We discuss, in detail, the case without derivative interactions, and compare our results with those found in massive bigravity.
Keywords
Cite
@article{arxiv.1610.00553,
title = {A general theory of linear cosmological perturbations: bimetric theories},
author = {Macarena Lagos and Pedro G. Ferreira},
journal= {arXiv preprint arXiv:1610.00553},
year = {2017}
}
Comments
Published version with extra comments in conclusion