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RS Electrogravitic References
this effect combines aspects of both the
Casimir and the Aharonov-Bohm effects. The
coupling to the quantized electromagnetic field
tends to decrease the amplitude of the
interference oscillations, and hence is a form
of decoherence. The contributions due to
photon emission and to vacuum fluctuations
may be separately identified. It is to be
expected that photon emission leads to
decoherence, as it can reveal which path an
electron takes. It is less obvious that vacuum
fluctuations also can cause decoherence. What
is directly observable is a shift in the
fluctuations due, for example, to the presence
of a conducting plate. In the case of electrons
moving parallel to conducting boundaries, the
dominant decohering influence is that of the
vacuum fluctuations. The shift in the
interference amplitudes can be of the order of a
few percent, so experimental verification of
this effect may be possible. The possibility of
using this effect to probe the interior of matter,
e.g., to determine the electrical conductivity of
a rod by means of electrons encircling it is
discussed. (Presented at the Conference on
Fundamental Problems in Quantum Theory,
University of Maryland, Baltimore County,
June 18-22, 1994.)
GENERAL RELATIVITY & QUANTUM
COSMOLOGY, ABSTRACT GR-
QC/9410043 PHYS. REV. D 51, 4277(1995).
FROM: FORD@TUHEP.PHY.TUFTS.EDU
Date: Fri, 28 Oct 1994 20:33 EST
AVERAGED ENERGY CONDITIONS AND
QUANTUM INEQUALITIES, L.H. FORD
AND THOMAS A. ROMAN
Connections are uncovered between the
averaged weak (AWEC) and averaged null
(ANEC) energy conditions, and quantum
inequality restrictions on negative energy for
free massless scalar fields. In a twodimensional
compactified Minkowski
universe, we derive a covariant quantum
inequality-type bound on the difference of the
expectation values of the energy density in an
arbitrary quantum state and in the Casimir
vacuum state. From this bound, it is shown that
the difference of expectation values also obeys
AWEC and ANEC-type integral conditions. In
contrast, it is well-known that the stress tensor
in the Casimir vacuum state alone satisfies
neither quantum inequalities nor averaged
energy conditions. Such difference inequalities
represent limits on the degree of energy
condition violation that is allowed over and
above any violation due to negative energy
densities in a background vacuum state. In our
simple two-dimensional model, they provide
physically interesting examples of new
constraints on negative energy which hold
even when the usual AWEC, ANEC, and
quantum inequality restrictions fail. In the limit
when the size of the space is allowed to go to
infinity, we derive quantum inequalities for
timelike and null geodesics which, in
appropriate limits, reduce to AWEC and
ANEC in ordinary two-dimensional
Minkowski spacetime. We also derive a
quantum inequality bound on the energy
density seen by an inertial observer in fourdimensional
Minkowski spacetime. The bound
implies that any inertial observer in flat
spacetime cannot see an arbitrarily large
negative energy density which lasts for an
arbitrarily long period of time.
GENERAL RELATIVITY & QUANTUM
COSMOLOGY, ABSTRACT GR-
QC/9411053 From: "Haret Rosu" Date: 20
Nov 94 21:15:00 CST
On the assignment of frequency spectra to
quantum vacuum effects, Author: Haret C.
Rosu, Report: IFUG-25/94, I discuss in an
introductory manner, i.e., in the form of
comments on available references, the problem
of assigning frequency spectra to such
fundamental effects like Casimir, Hawking,
Unruh, and squeezing effects. This may help to
clarify their differences as well as their
similarities.
GENERAL RELATIVITY & QUANTUM
COSMOLOGY, ABSTRACT GR-
QC/9411056 From: ulvi@tapir.Caltech.EDU
(Ulvi Yurtsever) Date: Mon, 21 Nov 94
15:56:11 -0800
The averaged null energy condition and
difference inequalities in quantum field theory,
by: Ulvi Yurtsever
Recently, Larry Ford and Tom Roman have
discovered that in a flat cylindrical space,
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