Topological aspects of QCD
Abstract
We review recent results from lattice on topological aspects of QCD: most of the results refer to monopoles and to instantons. We discuss in detail the evidence for condensation of monopoles in the vacuum and confinement of colour by dual superconductivity, and the major role of monopoles in dynamics (monopole dominance). As for instantons we review the U(1) problem, a possible determination of the spin content of the proton, and new lattice data relevant to instanton liquid models.
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