Gauge fixing and extended Abelian monopoles in SU(2) gauge theory in 2+1 dimensions.

Extended Abelian monopoles are investigated in SU(2) lattice gauge theory in three dimensions. Monopoles are computed by Abelian projection in several gauges, including the maximal Abelian gauge. The number Nm of extended monopoles in a cube of sizem3 (in lattice units) is defined as the number of elementary (13) monopoles minus antimonopoles in the cube (m = 1, 2, . . .). The distribution of 13 monopoles in the nonlocal maximal Abelian gauge is shown to be essentially random, while nonscaling of the density of 13 monopoles in some local gauges, which has been previously observed, is shown to be mainly due to strong short-distance correlations. The density of extended monopoles in local gauges is studied as a function of β for monopoles of fixed physical “size” (m/β = fixed); the degree of scale violation is found to decrease substantially as the monopole size is increased. The possibility therefore remains that long distance properties of monopoles in local gauges may be relevant to continuum physics, such as confinement. Typeset using REVTEX