Singular Quantum Mechanical Viewpoint of Localized Gravity in Brane-World Scenario

TL;DR

This paper analyzes the localization of gravitons in Randall-Sundrum brane-world models using singular quantum mechanics, revealing conditions for massless graviton existence depending on boundary conditions and brane configurations.

Contribution

It provides a quantum mechanical framework for understanding graviton localization and derives criteria for massless gravitons in different brane scenarios.

Findings

Massless graviton exists in single brane and positive-tension brane with infinite separation.

No massless graviton in two-brane model with finite separation.

Boundary conditions critically influence graviton mass spectrum.

Abstract

The graviton localized on the 3-brane is examined in Randall-Sundrum brane-world scenario from the viewpoint of one-dimensional singular quantum mechanics. For the Randall-Sundrum single brane scenario the one-parameter family of the fixed-energy amplitude is explicitly computed where the free parameter $\xi$ parametrizes the various boundary conditions at the brane. The general criterion for the localized graviton to be massless is derived when $\xi$ is arbitrary but non-zero. When $\xi=0$, the massless graviton is obtained via a coupling constant renormalization. For the two branes picture the fixed-energy amplitude is in general dependent on the two free parameters. The numerical test indicates that there is no massless graviton in this picture. For the positive-tension brane, however, the localized graviton becomes massless when the distance between branes are infinitely large, which is essentially identical to the single brane picture. For the negative-tension brane there is no massless graviton regardless of the distance between branes and choice of boundary conditions.