Cosmology in Brans-Dicke-de Rham-Gabadadze-Tolley massive gravity

TL;DR

This paper introduces a new extension of nonlinear massive gravity called Brans-Dick de Rham-Gabadadze-Tolley theory, analyzing its cosmological solutions and perturbations to explain the universe's accelerated expansion.

Contribution

The paper develops the Brans-Dick dRGT massive gravity theory and studies its cosmological implications, including background equations and perturbation analysis.

Findings

Existence of self-accelerating solutions for cosmic acceleration

Transformation between Jordan and Einstein frames

Analysis of tensor, vector, and scalar perturbations

Abstract

We introduce the Brans-Dick de Rham-Gabadadze-Tolley massive gravity theory which is the new extension of nonlinear massive gravity. We demonstrate a detailed study of the cosmological properties of this theory of gravity, and we show the transformation of the Jordan frame to the Einstein frame. We obtain the cosmological background equations and show the analyses of self-accelerating solutions for explaining the accelerated expansion of the Universe. In the following, we analyze the background perturbations, which consist of tensor, vector, and scalar perturbations within the framework of the Brans-Dick dRGT massive gravity in the Friedman-Lema{\i}tre-Robertson-Walker cosmology.