THERMODYNAMIC-TYPE ASPECT OF QUANTUM TIME EVOLUTION

The familiar analogy between the quantum time evolution of an isolated system and the thermal equilibrium of an open system with a thermosta t is considered as a signal of a profound thermodynamic-type aspect of the physical time, suggesting small nonunitarity corrections to the c onventional quantum theory. These imply, as their characteristic conse quence, a tiny unitarity defect of S matrix. Another surprising conseq uence is a slight time dependence of mass of any matter system localiz ed close to an experimental device such as a running supercollider or a big laser in action, where an intensive particle flow is produced. T his suggests a described gedankenexperiment.