Can Galileons support Lorentzian wormholes?
Abstract
We discuss the possibility of constructing stable, static, spherically symmetric, asymptotically flat Lorentzian wormhole solutions in General Relativity coupled to a generalized Galileon field . Assuming that Minkowski space-time is obtained at , we find that there is tension between the properties of the energy-momentum tensor required to support a wormhole (violation of average null energy conditions) and stability of the Galileon perturbations about the putative solution (absence of ghosts and gradient instabilities). In 3-dimensional space-time, this tension is strong enough to rule out wormholes with above properties. In higher dimensions, including the most physically interesting case of 4-dimensional space-time, wormholes, if any, must have fairly contrived shapes.
Cite
@article{arxiv.1509.08808,
title = {Can Galileons support Lorentzian wormholes?},
author = {V. A. Rubakov},
journal= {arXiv preprint arXiv:1509.08808},
year = {2016}
}
Comments
Error corrected, results and conclusions unchanged. Journal version, to appear in Theoretical and Mathematical Physics