2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189326We review recent developments and open questions for the description of nonequilibrium quantum fields, continuing hep-ph/0302210 and hep-ph/0410330.Based on invited talk at SEWM06, 10 pages, appears in the proceedingsHigh Energy Physics - Phenomenologytext