paper

Gauge Theories from Orientifolds and Large N Limit

arXiv:hep-th/9803214 · doi:10.1016/S0550-3213(98)00366-6

Abstract

Extending the recent work in hep-th/9803076, we consider string perturbative expansion in the presence of D-branes and orientifold planes imbedded in orbifolded space-time. In the limit the weak coupling string perturbative expansion maps to `t Hooft's large N expansion. We focus on four dimensional supersymmetric theories, and also discuss possible extensions to cases. Utilizing the string theory perturbation techniques we show that computation of any M-point correlation function in these theories reduces to the corresponding computation in the parent theory. In particular, we discuss theories (which are rather constrained) with vanishing beta-functions to all orders in perturbation theory in the large N limit. We also point out that in theories with non-vanishing beta-functions the gauge coupling running is suppressed in the large N limit. Introduction of orientifold planes allows to construct certain gauge theories with SO, Sp and SU gauge groups and various matter (only unitary gauge groups with bi-fundamental/adjoint matter arise in theories without orientifold planes).

27 pages, revtex, 3 figures, minor misprints corrected

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