Cosmology of Dirac-Born-Infeld dRGT massive gravity

TL;DR

This paper explores a new extension of dRGT massive gravity incorporating a Dirac-Born-Infeld scalar field, analyzing its cosmological solutions, gravitational wave behavior, and stability conditions.

Contribution

It introduces the Dirac-Born-Infeld dRGT massive gravity theory and investigates its cosmological background, perturbations, and stability, which is a novel extension of existing massive gravity models.

Findings

Identifies self-accelerating solutions with an effective cosmological constant.

Derives the dispersion relation for gravitational waves in the theory.

Analyzes stability conditions for scalar and vector perturbations.

Abstract

We introduce the cosmological analysis of the Dirac-Born-Infeld dRGT massive gravity theory which is a new extension of de Rham-Gabadadze-Tolley (dRGT) massive gravity. In this theory, we consider the Dirac-Born-Infeld (DBI) scalar field which is coupled to the graviton field. Moreover, we perform the cosmological background equations, and we demonstrate the self-accelerating background solutions. We show that the theory consists of self-accelerating solutions with an effective cosmological constant. In the following, we exhibit tensor perturbations analyses and achieve the dispersion relation of gravitational waves. We analyze the propagation of gravitational perturbation in the Friedmann-Lema\^itre-Robertson-Walker cosmology in the DBI dRGT massive gravity. Finally, we present the vector and scalar perturbations to show the stability conditions of the theory.