The world is not enough
Luis A. Anchordoqui, Santiago E. Perez Bergliaffa

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''.
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