Abstract

We perform a detailed study of the critical behavior of the mean field diluted Isingferromagnet using analytical and numerical tools. We obtain self-averaging for themagnetization and write down an expansion for the free energy close to the critical line.The scaling of the magnetization is also rigorously obtained and compared with extensiveMonte Carlo simulations. We explain the transition from an ergodic region to anon-trivial phase by commutativity breaking of the infinite volume limit and a suitablevanishing field. We find full agreement among theory, simulations and previousresults.

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