Topological Characteristics of Random Surfaces Generated by Cubic Interactions

Details Topological Characteristics of Random Surfaces Generated by Cubic Interactions Topological Characteristics of Random Surfaces Generated by Cubic Interactions

2003-06-11

arxiv.org/abs/gr-qc/0306049v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Scientific paper

We consider random topologies of surfaces generated by cubic interactions. Such surfaces arise in various contexts in 2-dimensional quantum gravity and as world-sheets in string theory. Our results are most conveniently expressed in terms of a parameter h = n/2 + \chi, where n is the number of interaction vertices and \chi is the Euler characteristic of the surface. Simulations and results for similar models suggest that Ex[h] = log (3n) + \gamma + O(1/n) and Var[h] = log (3n) + \gamma - \pi^2/6 + O(1/n). We prove rigourously that Ex[h] = log n + O(1) and Var[h] = O(log n). We also derive results concerning a number of other characteristics of the topology of these random surfaces.

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