Critical fluctuations in kinetic Ising models are interpreted in terms of cluster reactions. The basic assumption, that clusters with l spins grow at a rate ∝lʳ, is tested by Monte Carlo computations in the single-spin-flip case. The dynamic susceptibilities associated with order parameter and energy are then calculated also for nonzero magnetic field, and are shown to fulfill dynamic scaling. The exponent (2-r)βδ of the relaxation times can be different from the susceptibility exponent γ.
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Binder et al. (1974) studied this question.
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