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The lifetimes of metastable states in kinetic Ising ferromagnets are studiedby droplet theory and Monte Carlo simulation, in order to determine theirdependences on applied field and system size. For a wide range of fields, thedominant field dependence is universal for local dynamics and has the form ofan exponential in the inverse field, modified by universal and nonuniversalpower-law prefactors. Quantitative droplet-theory predictions are numericallyverified, and small deviations are shown to depend nonuniversally on thedetails of the dynamics. We identify four distinct field intervals in which thefield dependence and statistical properties of the lifetimes are different. Thefield marking the crossover between the weak-field regime, in which the decayis dominated by a single droplet, and the intermediate-field regime, in whichit is dominated by a finite droplet density, vanishes logarithmically withsystem size. As a consequence the slow decay characteristic of the formerregime may be observable in systems that are macroscopic as far as theirequilibrium properties are concerned.Comment: 18 pages single spaced. RevTex Version 3. FSU-SCRI-94-1

Metastable lifetimes in a kinetic Ising model: Dependence on field and system size