QCD condensate contributions to the effective quark potential in a covariant gauge

Abstract

We discuss QCD condensate contributions to the gluon propagator both in the fixed-point gauge and in covariant gauges for the external QCD vacuum gluon fields with the conclusion that a covariant gauge is essential to obtain a gauge invariant QCD vacuum energy density difference and to retain the unitarity of the quark scattering amplitude. The gauge-invariant QCD condensate contributions to the effective one-gluon exchange potential are evaluated by using the effective gluon propagator which produces a gauge-independent quark scattering amplitude.

17 pages, 2 figures

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Cited by in corpus (3)

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• Vacuum condensates, effective gluon mass and color confinement in a new reformulation of QCD
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