A Universal Fractal Structure of 2D Quantum Gravity for c > 1

Abstract

We investigate the fractal structure of $2d$ quantum gravity coupled to matter by measuring the distributions of so-called baby universes. We demonstrate that the method works well as long as $c\le 1$. For $c>1$ it is not clear what distribution to expect. However, we observe strikingly similar distributions for various kinds of matter fields with the same $c$. This indicate that there might be some range of $c>1$ where the central charge of the matter fields alone determines the fractal structure of gravity coupled to matter. The hypothesis that the string susceptibility $\g = 1/3$ is found to be compatible with the data for $1<c\le 4$.

12 pages. compressed postscript file. Uncompressed size 3 Mb. Latex file without figures available by request. NBI-HE-93-64

References in corpus (3)

• Baby universes in 2d quantum gravity
• Low Temperature Expansion of Matrix Models
• Critical behavior of target space mean field theory

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