Field Strength Correlator and an Infrared Fixed Point of the Wilsonian Exact Renormalization Group Equations

The correlator of two field strengths is computed from an effective action for Yang Mills theories, which contains both gluons and an auxiliary antisymmetric tensor field for the field strength as local variables. This action allows to relate explicitly many different approaches to confinement, and is computed using Wilsonian renormalization group equations with the bare Yang Mills action as starting point. Due to the inclusion of a higher dimensional operator in the ghost sector the running gauge coupling becomes vanishingly small at a critical scale kc, and the resulting low energy action resembles the action of a confining string theory proposed by Polyakov. LPTHE Orsay 98-48 July 1998 email : [email protected] Laboratoire associé au Centre National de la Recherche Scientifique (URA D0063)