  Entropy production in quantum (field) systems requiring environment-induced
decoherence is described in a Gaussian variational approximation. The new
phenomenon of Semiquantum Chaos is reported. (Presented at the International
Conference on Nonlinear Dynamics, Chaotic and Complex Systems, Zakopane
(Poland), 7-12.11.95.)

Quantum Physics;Chaotic Dynamics;High Energy Physics - Theory;Chaotic Dynamics;Nuclear Theory