Abstract
The Coulomb gauge offers a simple confinement scenario. As originally proposed by Gribov [1], and supported recently by detailed arguments [2], D 0,0, the time-time component of the gluon propagator, provides a long-range confining force, while D i,j , the 3-dimensionally transverse propagator of would-be physical gluons is suppressed at low momentum, reflecting the disappearance of gluons from the physical spectrum. This different behavior of spatial and temporal components of the gluon propagator in the Coulomb gauge obviously cannot hold in a covariant gauge. These properties of the Coulomb-gauge propagator are a consequence of the particular shape of the physical configuration space. For in a gauge theory, the physical configuration space must be restricted to the fundamental modular region (FMR), a region that is free of Gribov copies.
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