Sunday, 18 February 2018

statistical mechanics - Critical slowing down in Monte-Carlo algorithm for classical 2D Ising Model


Why do local updates (i.e. local spin flips) near the phase transition in MC algorithm for classical 2D Ising model are said to be not "effective" and lead to incorrect critical indices? I understand that it is somehow connected with infinite correlation length, but how exactly? Does it mean that near phase transition it takes infinite time for algorithm to achieve equilibrium distribution?




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