Paper (*cross-listing*): gr-qc/0507079

Date: Mon, 18 Jul 2005 22:40:24 GMT (33kb)
Date (revised v2): Fri, 16 Dec 2005 17:44:01 GMT (36kb)

Title: Evaporation induced traversability of the Einstein--Rosen wormhole

Authors: S. Krasnikov

Comments: v.2 A bit of discussion has been added and a few references
\\
Suppose, the Universe comes into existence (as classical spacetime) already
with an empty spherically symmetric macroscopic wormhole present in it.
Classically the wormhole would evolve into a part of the Schwarzschild space
and thus would not allow any signal to traverse it. I consider semiclassical
corrections to that picture and build a model of an evaporating wormhole. The
model is based on the assumption that the vacuum polarization and its
backreaction on the geometry of the wormhole are weak. The lack of information
about the era preceding the emergence of the wormhole results in appearance of
three parameters which -- along with the initial mass -- determine the
evolution of the wormhole. For some values of these parameters the wormhole
turns out to be long-lived enough to be traversed and to transform into a time
machine.

\\ ( http://arXiv.org/abs/gr-qc/0507079 , 36kb)