2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/24417We show that the cyclic evolution of an order parameter in a many-body system with spontaneous symmetry breaking in the ground state brings about a dissipative geometric phase. This phase originates from the same mechanism that leads to dissipation in thermo-field dynamics studied earlier by Umezawa and his collaborators and appears to be a manifestation of the dissipative geometric phase introduced recently by Jain and Pati.LaTeX file, 7 two-column pages;typos corrected;added lines on figuresOther Condensed MatterStatistical MechanicsQuantum Physicstext