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arXiv · 2210.09664

Analysis of the finite-size effect of the long-range Ising model under Glauber dynamics

Hisato Komatsu
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Abstract

We considered a long-range Ising model under Glauber dynamics and calculated the difference from the mean-field approximation in a finite-size system using perturbation theory. To deal with the BBGKY hierarchy, we assumed that certain types of extensive properties have a Gaussian distribution, which turned out to be equivalent to the Kirkwood superposition approximation within the range of first-order perturbation. After several calculations, ordinary differential equations that describe the time development of a two-body correlation were derived. This discussion is the generalization of our previous study which developed a similar consideration on the infinite-range Ising model. The results of the calculation fit those of the numerical simulations for the case in which the decay of the interaction was sufficiently slow; however, they exhibited different behaviors when the decay became rapid.

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Hisato Komatsu. 2022-10-18. Analysis of the finite-size effect of the long-range Ising model under Glauber dynamics. https://doi.org/10.1088/1742-5468%2Facc31f

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