paper

String Expansion as Large N Expansion of Gauge Theories

arXiv:hep-th/9803076 · doi:10.1016/S0550-3213(98)00272-7

Abstract

We consider string perturbative expansion in the presence of D-branes imbedded in orbifolded space-time. In the regime where the string coupling is weak and , the string perturbative expansion coincides with `t Hooft's large N expansion. We specifically concentrate on theories with d=4 and , and use world-sheet orbifold techniques to prove vanishing theorems for the field theory beta functions to all orders in perturbation theory in the large N limit. This is in accord with recent predictions.

18 pages, harvmac, minor corrections and additional references

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