Showing papers on "Euclidean quantum gravity published in 1986"
TL;DR: In this article, a measurement of the gravitational properties of antimatter would be of great value in distinguishing between the various theoretical possibilities, which would also be relevant to the study of classical effects predicted by quantum gravity theories.
75 citations
TL;DR: In this paper, the authors present a formulation of quantum gravity in two dimensions on simplicial lattices, with an action involving cosmological constant and higher derivative terms, for weak field approximation and Monte Carlo calculations.
54 citations
TL;DR: In this paper, a four-dimensional model for discrete euclidean quantum gravity is simulated and it is shown that entropy might cure the problem of the unboundedness of the gravitational action.
39 citations
TL;DR: In this paper, a simplicial quantum gravity with an extremely strong form of diffeomorphism symmetry of the functional integral measure (λ d l e −S pg ) is proposed using the method of mathematical induction.
37 citations
TL;DR: In this paper, the authors considered lattice Euclidean quantum gravity, formulated in analogy to the usual gauge theories, and proved that positivity is satisfied only for a special set of quantities which, however, in the continuum limit furnish the expectation values of the closed loops and correlation functions thereof.
22 citations
TL;DR: In this paper, the essential structure is reformulated in a coarse-grained model which might be regarded as an Ising model of gravity, and the functional integral of a modified model is reduced to the same sum over simplicial manifolds.
Abstract: Starting with a formulation of the diffeomorphism group in Regge calculus the authors propose a natural gauge fixing which then gives a suitable approximation of functional integrals in the strong-coupling regime. Summing over different connectivities including fluctuations in topology becomes crucial. The essential structure is reformulated in a coarse-grained model which might be regarded as an 'Ising model of gravity'. Relations to the theory of amorphous structures are pointed out. In a second approach they reduce the functional integral of a modified model to the same sum over simplicial manifolds.
15 citations
TL;DR: In this paper, a modification of the canonical commutation relations of gravity in order to ensure that covariance is maintained for non-commuting tensor operators is presented, and the algebra of the quantum operator constraints is found to close exactly as in the classical case.
Abstract: In the previous paper, a proposal was advanced for the ordering of the operatorsOpen image in new windowμ that arise in Dirac's programme for the quantization of gravity. The resulting algebra, however, was found to contain an undesired anomalous operator. Here we present a minimal modification of the canonical commutation relations of gravity in order to ensure that covariance is maintained for noncommuting tensor operators. As a result of the modification, the algebra of the quantum operator constraints is found to close exactly as in the classical case.
12 citations
TL;DR: In this article, the equivalence of tow-dimensional quantum gravity interacting with a total number of scalar and Dirac-fermion degrees of freedom less of 26 and quantum Liouvill field theory was shown.
Journal Article•
01 Jan 1986
TL;DR: In this article, the main topics discussed are: Quantum field theory, inflationary universe, supergravity, gravitational waves, chiral symmetry, string models, and Kaluza-Klein theory.
Abstract: This book discusses the papers on Quantum gravity and cosmology. The main topics discussed are: Quantum field theory; inflationary Universe; supergravity; gravitational waves; chiral symmetry; string models; and Kaluza-Klein theory.
01 Nov 1986
TL;DR: In this article, a brief analysis of the remaining contenders for a space-time theory of gravity is presented, along with a brief comparison of the three remaining contenders. But the analysis is limited to a single point of view.
Abstract: Experimental advances in gravity physics have narrowed down possible candidates for a space-time theory of gravity to only a few. In this note a brief analysis of three of the remaining contenders is presented.