Gauge Invariant Quark Propagator in the Instanton Background

Abstract

After a general discussion on the choice of gauge, we compare the quark propagator in the background of one instanton in regular and singular gauge with a gauge invariant propagator obtained by inserting a path-ordered gluon exponential. Using a gauge motivated by this analysis, we were able to obtain a finite result for the quark condensate without introducing an infrared cutoff nor invoking some instanton model.

Comments: 15 latex pages, 1 figure, macros: epsf.sty