Statics and Dynamics of Metastability

概要

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Metastability in the system with short-range forces is discussed from unified viewpoints of statics and dynamics. The system-size dependence of the double-minimum free-energy is argued after exact calculations with a spherical model. A coercive field is defined by statics, which agrees with that of the critical droplet theory and characterizes super-critical or subcritical situations. In dynamics a long-wavelength cutoff theory is applied to finite systems. A coercive field for a finite system is also defined by this dynamics, thich just agrees with that defined by statics. It is shown that the mechanism of the decay process of metastable states is an instability of the long-range spatial fluctuation in the super-critical region and is a stochastic barrier penetration in the sub-critical region. Results are compared with computer experiments on finite systems.
理論物理学刊行会の論文
1980-08-25