On kinetic Ising models in one dimension

Abstract
It is shown that Glauber dynamics in 1D Ising spin systems is not universal. This is illustrated on a periodic model with a basic unit cell (J1,. . ., Jn) containing an arbitrary set of n ferromagnetic coupling constants. The dynamic critical exponent z is calculated exactly as z=1+max(Ji)/min(Ji), the known value z=2 is recovered only for n=1. The extension of this result to other types of dynamics is briefly discussed.

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