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Disorder Solutions for Generalized Ising and Potts Models with Multispin Interaction

Неупорядоченные решения обобщенных моделей Изинга и Поттса с мультиспиновым взаимодействием
Authors: Khrapov, P.V.;

Disorder Solutions for Generalized Ising and Potts Models with Multispin Interaction

Abstract

In this work, a special elementary transfer matrix is constructed for generalized Ising models and Potts models with the general form of a finite Hamiltonian with a multi-spin interaction in a space of arbitrary dimensionality, the Napierian logarithm of its maximum eigenvalue is equal to the free energy of the system. In some cases, it was possible to obtain an explicit form of the eigenvector corresponding to the largest eigenvalue of the elementary transfer matrix. On this basis we obtained systems of nonlinear equations for the interaction coefficients of the Hamiltonian for finding the exact value of the free energy on a set of disorder solutions. Using the Levenberg-Marquardt method, the existence of nontrivial solutions of the resulting systems of equations for plane and three-dimensional Ising models was shown. In some special cases (the 2D Ising model, the interaction potential, including the interaction of the next nearest neighbors and quadruple interactions; the 3D model with a special Hamiltonian symmetric relative to the change of all spin signs, for which it is possible to reduce the system of equations to the system for a planar model) three parameters are written in explicit form. The domain of existence of these solutions is described. В работе построена специальная элементарная трансфер-матрица для обобщенных моделей Изинга и моделей Поттса с общим видом финитного гамильтониана с мультиспиновым взаимодействием в пространстве произвольной размерности, натуральный логарифм максимального собственного значения которой равен свободной энергии системы. В некоторых случаях удалось получить явный вид собственного вектора, отвечающего наибольшему собственному значению элементарной трансфер-матрицы. На основе этого выведены системы нелинейных уравнений на коэффициенты взаимодействия гамильтониана для нахождения точного значения свободной энергии на множестве неупорядоченных решений (disorder solutions). Методом Левенберга-Марквардта показано существование нетривиальных решений получающихся систем уравнений для плоских и трехмерных моделей Изинга. В некоторых частных случаях (2D модель Изинга, потенциал взаимодействия, включающий взаимодействие следующих ближайших соседей и четверные взаимодействия; 3D модель со специальным гамильтонианом, симметричным относительно перемены всех знаков спинов, для которой удается свести систему уравнений к системе для плоской модели) решения, зависящие от трех параметров, выписаны в явном виде. Описана область существования этих решений.

Related Organizations
Keywords

statistical sum, мультиспиновое взаимодействие, неупорядоченные решения (disorder solutions), QA75.5-76.95, free energy, трансфер-матрица, свободная энергия, Hamiltonian, generalized Ising model, generalized Potts model, disorder solutions, Electronic computers. Computer science, multi-spin interaction, обобщенная модель Изинга, transfer matrix, гамильтониан, статистическая сумма, free energy., обобщенная модель Поттса

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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