Breaking the $Z_2$ symmetry of the Randall-Sundrum scenario and the fate of the massive modes

TL;DR

This paper investigates the effects of breaking the $Z_2$ symmetry in the Randall-Sundrum model, showing that resonances in massive modes are weak and occur at high masses, thus minimally impacting Newtonian gravity.

Contribution

It provides an explicit analysis of asymmetric brane scenarios, linking their modes to symmetric cases and examining the resonance behavior analytically.

Findings

Resonances are very mild even with strong asymmetries.

Resonances occur only at very large masses.

Effects on Newtonian potential are exponentially suppressed.

Abstract

We address in detail the issue of possible resonances in the massive modes on a brane without reflection symmetry. After identifying a set of solvability conditions, we show explicitly how the modes of the asymmetric case can be traced back to the modes of the symmetric RS-2 scenario. The possible occurrence of resonances is revisited and discussed by finding analytical solutions. We find that the resonant behavior is very mild even for strong asymmetries, and moreover it occurs only for very large masses, so that its effects on the Newtonian potential are exponentially suppressed.