Ringing the Randall-Sundrum braneworld: metastable gravity wave bound states

TL;DR

This paper investigates how gravity waves in the Randall-Sundrum braneworld model exhibit resonant quasinormal modes, which appear as metastable bound states or decaying massive gravitons, with potential implications for gravitational physics.

Contribution

It demonstrates the existence of complex quasinormal frequencies for bulk gravity waves in the Randall-Sundrum scenario, revealing a novel resonant structure analogous to black hole ringing.

Findings

Identification of characteristic quasinormal frequencies

Interpretation as metastable gravity wave bound states

Discussion of potential physical implications

Abstract

In the Randall-Sundrum scenario, our universe is a 4-dimensional `brane' living in a 5-dimensional bulk spacetime. By studying the scattering of bulk gravity waves, we show that this brane rings with a characteristic set of complex quasinormal frequencies, much like a black hole. To a bulk observer these modes are interpreted as metastable gravity wave bound states, while a brane observer views them as a discrete spectrum of decaying massive gravitons. Potential implications of these scattering resonances are discussed.