Linear Stability of $f(R,Ï,X)$ Thick Branes: Tensor Perturbations
arXiv:1802.01454 · doi:10.1007/JHEP11(2018)083
Abstract
We explore thick branes in $f(R,Ï,X)$ gravity. We obtain the linear tensor perturbation equation of $f(R,Ï,X)$ branes and show that the branes are stable against the tensor perturbations under the condition of $\frac{\partial f(R,Ï,X)}{\partial R}>0$. 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 $f(R,Ï,X)$ 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 $f(R,Ï,X)$ thick brane are also discussed.
23 pages, 5 figures