Exploration of Multi-Dimensional Density of States by Multicanonical Monte Carlo Algorithm

概要

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Multi-dimensional density of states provides a useful description of complex frustrated systems. Recent advances in Monte Carlo methods enable efficient calculation of the density of states and related quantities, which renew interest in them. Here we calculate density of states on the plane (energy, magnetization) for an Ising model with three-spin interactions on a random sparse network, which is a system of current interest both in physics of glassy systems and in the theory of error-correcting codes. Multicanonical Monte Carlo algorithm is successfully applied, and the shape of densities and its dependence on the degree of frustration are revealed. Efficiency of multicanonical Monte Carlo is also discussed, referring to the shape of a projection of the distribution simulated by the algorithm.
理論物理学刊行会の論文
2005-04-30