http://arxiv.org/abs/hep-th/0504003

High Energy Physics - Theory, abstract
hep-th/0504003
From: Roman Buniy [view email]
Date (v1): Fri, 1 Apr 2005 00:58:22 GMT (23kb)
Date (revised v2): Sun, 3 Apr 2005 02:32:23 GMT (22kb)

Semi-classical wormholes and time machines are unstable

Authors: Roman V. Buniy, Stephen D.H. Hsu
Comments: 3 pages, 1 figure, revtex

We show that Lorentzian (traversable) wormholes and time machines with semi-classical spacetimes are unstable due to their violation of the null energy condition (NEC). Semi-classicality of the energy-momentum tensor in a given quantum state (required for semi-classicality of the spacetime) implies localization of its wavefunction in phase space, leading to evolution according to the classical equations of motion. Previous results related to violation of the NEC then require that the configuration is unstable to small perturbations.