O ct 1 99 7 Constraints and Solutions of Quantum Gravity in Metric Representation

ar X iv : g r - qc / 9 71 01 37 v 1 3 1 O ct 1 99 7 METRIC FLUCTUATIONS IN SEMICLASSICAL GRAVITY ∗

The Einstein-Langevin equation is a perturbative correction to the semiclassical Ein-stein equation which takes into account the lowest order quantum fluctuations of the matter stress-energy tensor. It predicts classical stochastic fluctuations in the metric field which may describe some of the remnant gravitational fluctuations after the process of environment induced decoherence driving the q...

ar X iv : g r - qc / 9 71 00 20 v 1 3 O ct 1 99 7 THE RELIABILITY HORIZON

The " reliability horizon " for semi-classical quantum gravity quantifies the extent to which we should trust semi-classical quantum gravity, and gives a handle on just where the " Planck regime " resides. The key obstruction to pushing semi-classical quantum gravity into the Planck regime is often the existence of large metric fluctuations, rather than a large back-reaction.

O ct 1 99 1 UCSB - TH - 91 - 41 QUANTUM GRAVITY AND STRING THEORY – WHAT HAVE WE LEARNED ? ∗

X iv : h ep - l at / 9 21 00 15 v 1 9 O ct 1 99 2 THE NATURE OF THE CONTINUUM LIMIT IN STRONGLY COUPLED QUENCHED QED

We review the results of large scale simulations[1] of noncompact quenched QED which use spectrum and Equation of State calculations to determine the theory’s phase diagram, critical indices, and continuum limit. The resulting anomalous dimensions are in good agreement with Schwinger-Dyson solutions of the ladder graphs of conventional QED and they satisfy the hyperscaling relations expected of...

ar X iv : g r - qc / 9 51 00 70 v 1 3 1 O ct 1 99 5 The Equivalence Principle and g - 2 Experiments

We consider the possibility of using measurements of anomalous magnetic moments of elementary particles as a possible test of the Einstein Equivalence Principle (EEP). For the class non-metric theories of gravity described by the T Hǫµ formalism we find several novel mechanisms for breaking the EEP, and discuss the possibilities of setting new empirical constraints on such effects.