The world is not enough

TL;DR

This paper reveals that Randall-Sundrum 5D models are essentially wormholes, explores scalar particle trapping in such spacetimes, and introduces a brane-world cosmology model using surgical grafting in anti-de Sitter space.

Contribution

It demonstrates the wormhole nature of RS models, analyzes scalar particle trapping, and proposes a new brane-world cosmology model with static AdS background.

Findings

RS models are half-wormholes

Scalar particles can be gravitationally trapped

A brane-world cosmology model using surgical grafting

Abstract

We show that the 5-dimensional model introduced by Randall and Sundrum is (half of) a wormhole, and that this is a general result in models of the RS type. We also discuss the gravitational trapping of a scalar particle in 5-d spacetimes. Finally, we present a simple model of brane-world cosmology in which the background is a static anti-de Sitter manifold, and the location of the two 3-branes is determined by the technique of ``surgical grafting''.