Random Geometries in Quantum Gravity
Abstract
We describe the idea of studying quantum gravity by means of dynamical triangulations and give examples of its implementation in 2, 3 and 4 space time dimensions. For $d=2$ we consider the generic hermitian 1matrix model. We introduce the socalled moment description which allows us to find the complete perturbative solution of the generic model both away from and in the continuum. Furthermore we show how one can easily by means of the moment variables define continuum times for the model so that its continuum partition function agrees with the partition function of the Kontsevich model except for some complications at genus zero. Finally we study the non perturbative definition of 2D quantum gravity provided by stochastic stabilization, showing how well known matrix model characteristica can be given a simple quantum mechanical interpretation and how stochastic quantization seems to hint to us the possibility of a strong coupling expansion of 2D quantum gravity. For $d=3$ and $d=4$ we consider the numerical approach to dynamically triangulated gravity. We present the results of simulating pure gravity as well as gravity interacting with matter fields. For $d=4$ we describe in addition the effect of adding to the Einstein Hilbert action a higher derivative term.
 Publication:

arXiv eprints
 Pub Date:
 October 1993
 arXiv:
 arXiv:hepth/9310020
 Bibcode:
 1993hep.th...10020K
 Keywords:

 High Energy Physics  Theory
 EPrint:
 78 pages, PostScript. Ph.D. thesis, The Niels Bohr Institute, University of Copenhagen, Sep. 1993