Abstract

We present an analytic Migdal - Kadanoff renormalization group analysis of the random field Ising model. The renormalization flows to a zero-temperature critical point, from which we calculate independently three critical exponents in arbitrary dimension. In three dimensions the magnetization exponent , and the Schwartz - Soffer inequality is almost satisfied as an equality. Expanding analytically in we find that and the distance from the upper bound of the equality go to zero exponentially with .

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