Multi-spin systems on a randomly triangulated surface

Details Multi-spin systems on a randomly triangulated surface Multi-spin systems on a randomly triangulated surface

1994-02-09

arxiv.org/abs/hep-th/9402052v1

Nucl.Phys. B426 (1994) 203-222

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, KUMI/94/2 (4 figures obtainable upon request)

Scientific paper

10.1016/0550-3213(94)90132-5

We consider a class of spin systems on randomly triangulated surfaces as discrete approximations to conformal matter fields coupled to 2d gravity. On the basis of certain universality assumptions we argue that at critical points with diverging string susceptibility the model either exhibits mean field behaviour or it can effectively be described by a conformal matter system with central charge less than or equal to 1 coupled to 2d gravity. As a particular consequence we conclude in the unitary case that the string susceptibility exponent is limited to possible values of the form 1/n, n=2,3,4,..., where n=2 corresponds to mean field behaviour.

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