From: Spudboy100@aol.com
Date: Wed Jul 17 2002 - 06:00:18 MDT
gr-qc/0207057
Title: The quantum inequalities do not forbid spacetime short-cuts
Author: S. Krasnikov
Comments: A draft
I consider a class of spacetimes comprising the Alcubierre bubble, Krasnikov
tube, and a certain type of wormholes. Such spacetimes (they are called
`short-cuts' in this paper) were suspected to be impossible because
calculations based on the `quantum inequalities' suggest that their existence
would involve unphysically large values of the `total amount of negative
energy' \tot. I argue that the spacetimes of this type may not be unphysical
at all. With specific examples I show that 1) the quantum inequalities in the
relevant form do not work even in the simplest case of the massless scalar
field in the two-dimensional Minkowski space, 2) \tot formally found with
semiclassical methods may be physically meaningless in some relevant
situations, and 3) short-cuts can be constructed which require only small
amount of negative energy. (45kb)
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