Application of large deviation theory to the mean-field phi^4-model

Ingo Hahn, Michael Kastner

Published 2005-09-08Version 1

A large deviation technique is used to calculate the microcanonical entropy function s(v,m) of the mean-field phi^4-model as a function of the potential energy v and the magnetization m. As in the canonical ensemble, a continuous phase transition is found. An analytical expression is obtained for the critical energy v_c(J) as a function of the coupling parameter J.