Migration of Unstable Vacuum for Dissipative Systems

Details Migration of Unstable Vacuum for Dissipative Systems Migration of Unstable Vacuum for Dissipative Systems

1998-09-16

arxiv.org/abs/hep-th/9809117v2

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, The 5th International Workshop on Thermal Field Theories and Its Applications (TFT98)

Scientific paper

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.

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