The Cosmological Impact of Brane-Chern-Simons Massive Gravity

TL;DR

This paper introduces a new massive gravity theory called Brane-Chern-Simons massive gravity, explores its cosmological implications including self-accelerating solutions, and tests its consistency with supernova observational data.

Contribution

It presents the first formulation of Brane-Chern-Simons massive gravity and analyzes its cosmological solutions and gravitational wave behavior.

Findings

Existence of self-accelerating solutions from an effective cosmological constant.

Derivation of gravitational wave dispersion relations in the new framework.

Compatibility of the theory with supernova observational data.

Abstract

In this paper, we present a novel extension of massive gravity theory; the Brane-Chern-Simons massive gravity theory. We explore the cosmological implications of this theory by deriving the background equations and demonstrating the existence of self-accelerating solutions. Interestingly, our theory suggests the existence of self-accelerating mechanisms that originate from an effective cosmological constant, leading to intriguing possibilities for understanding the nature of cosmic acceleration. Furthermore, we perform a tensor perturbation analysis to investigate the propagation of gravitational waves in this framework. We derive the dispersion relation for gravitational waves and study their behavior in the Friedmann-Lema\^itre-Roberson-Waker cosmology within the context of Brane-Chen-Simons massive gravity. Utilizing the latest Union2 type Ia supernova dataset comprising $557$ SNIa events, we provide observational support for our theoretical framework, indicating that the Brane-Chern-Simons massive gravity theory is consistent with cosmological observations.