Gauges in the bulk

TL;DR

This paper develops a framework for nonparallel brane worlds, deriving the effective action and analyzing the nonlinear radion, revealing its persistence in the second Randall-Sundrum model.

Contribution

It introduces a general gauge framework for nonparallel brane worlds and provides the effective action including the nonlinear radion dynamics.

Findings

Nonlinear radion persists in the second Randall-Sundrum model.

Effective action derived in the Einstein frame for Minkowski and (A)dS4 branes.

Framework applicable to various brane world configurations.

Abstract

We present a general framework for nonparallel brane worlds and use it to discuss the nonlinear radion problem. By imposing the Einstein frame as a gauge condition we are able to give the effective action for both Minkowski and (A)dS$_{4}$ branes. In particular we find the nonlinear radion does not disappear in the second Randall-Sundrum model.