We point out that the effective action of hot Yang-Mills theories has semi-classical solutions, which are naturally identified with monopole world Lines, "frozen" into the short imaginary time dimension. The solutions look like wall junctions: lines along which N electric Z(N) domain walls come together. They are instrumental in reconciling explicit perturbative calculations at high temperature with the magnetic Z(N) symmetry. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 23]
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