Migration of Unstable Vacuum for Dissipative Systems
Abstract
Description
Quantum field theory is constructed upon the assumption of stabilities of the vacuum and of the one-particle state. For finite temperature, the one-particle state becomes unstable because of thermal fluctuations, whereas the thermal vacuum is still stable. In non-equilibrium situation, both the vacuum and the one-particle state lose their stability. Proposed is the introduction of the {\it reference vacuum} which takes care of thermal and non-adiabatic time-evolution of a system, and produces a time-dependent Fock's representation space. This may provide us with an extension of the concept of {\it dynamical mapping} where a migration among unitary inequivalent representation spaces can be handled for non-equilibrium and dissipative systems.
10 pages, The 5th International Workshop on Thermal Field Theories and Its Applications (TFT98)
10 pages, The 5th International Workshop on Thermal Field Theories and Its Applications (TFT98)