The Schwartz–Soffer and more inequalities for random fields

A new series of correlation inequalities for random field spin systems is proven rigorously. First one corresponds to the well-known Schwartz–Soffer inequality. These are expected to rule out incorrect results calculated in effective theories and numerical studies. The large N expansion with the replica method for random field systems as an example is checked by these inequalities. It is shown that several critical exponents of multiple-point correlation functions at critical point satisfy obtained inequalities. (paper)