Self-Supporting Wormholes in Four Dimensions with Scalar Field

TL;DR

This paper explores how specific boundary conditions in four-dimensional anti-de Sitter space can produce traversable wormholes supported by scalar fields, with backreaction effects analyzed through perturbation theory.

Contribution

It demonstrates the construction of self-supporting traversable wormholes in four dimensions via quotienting AdS4 and boundary conditions, including backreaction effects.

Findings

Negative average null energy enables traversability.

Boundary conditions crucial for wormhole existence.

First-order perturbation estimates backreaction effects.

Abstract

In this paper, we investigated the space-time obtained by quotients of the $AdS_4$ space-time. Further quotient with specific $\mathbb{Z}_2$ is considered. Taking up to the first-order perturbation in metric, we estimated the backreaction of the matter field on space-time geometry. We can calculate the stress-energy tensor's expected value by pulling it back onto the covering space. The average null energy becomes negative when the suitable boundary condition is chosen, resulting in a traversable wormhole.