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The (φ4)2 field theory as a classical Ising model

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Abstract

We approximate a (spatially cutoff) (φ4)2 Euclidean field theory by an ensemble of spin 1/2 Ising spins with ferromagnetic pair interactions. This approximation is used to prove a Lee-Yang theorem and GHS type correlation inequalities for the (φ4)2 theory. Application of these results are presented.

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Simon, B., Griffiths, R.B. The (φ4)2 field theory as a classical Ising model. Commun.Math. Phys. 33, 145–164 (1973). https://doi.org/10.1007/BF01645626

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