Linear Stability of $f(R,\phi,X)$ Thick Branes: Tensor Perturbations

TL;DR

This paper investigates the stability and gravitational properties of thick branes in a generalized $f(R,, X)$ gravity framework, deriving exact solutions and analyzing graviton modes to ensure four-dimensional gravity recovery.

Contribution

It provides the first exact solutions of $f(R,, X)$ thick branes using reconstruction and analyzes their stability and graviton localization.

Findings

Branes are stable under tensor perturbations if $rac{ f(R,,X)}{ R}>0$.

Zero mode gravitons are localized, recovering Newtonian gravity.

Kaluza-Klein modes influence gravitational behavior on the brane.

Abstract

We explore thick branes in $f(R,\phi,X)$ gravity. We obtain the linear tensor perturbation equation of $f(R,\phi,X)$ branes and show that the branes are stable against the tensor perturbations under the condition of $\frac{\partial f(R,\phi,X)}{\partial R}>0$. In order to obtain thick brane solutions of the fourth-order field equations in this theory, we employ the reconstruction technique. We get exact solutions of the specific $f(R,\phi,X)$ thick brane generated by a non-canonical scalar field. It is shown that the zero mode of the graviton for the thick brane is localized under certain conditions. This implies that the four-dimensional Newtonian potential is recovered on the brane. The effects of the Kaluza-Klein modes of the graviton for the $f(R,\phi,X)$ thick brane are also discussed.