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- W3102056540 abstract "We propose an algorithm to obtain numerically approximate solutions of the direct Ising problem, that is, to compute the free energy and the equilibrium observables of spin systems with arbitrary two-spin interactions. To this purpose we use the Adaptive Cluster Expansion method, originally developed to solve the inverse Ising problem, that is, to infer the interactions from the equilibrium correlations. The method consists in iteratively constructing and selecting clusters of spins, computing their contributions to the free energy and discarding clusters whose contribution is lower than a fixed threshold. The properties of the cluster expansion and its performance are studied in detail on one dimensional, two dimensional, random and fully connected graphs with homogeneous or heterogeneous fields and couplings. We discuss the differences between different representations (Boolean and Ising) of the spin variables." @default.
- W3102056540 created "2020-11-23" @default.
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- W3102056540 date "2019-11-01" @default.
- W3102056540 modified "2023-10-12" @default.
- W3102056540 title "Adaptive cluster expansion for Ising spin models" @default.
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- W3102056540 doi "https://doi.org/10.1140/epjb/e2019-100313-9" @default.
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