Non-perturbative states in the three-dimensional phi4 theory
Abstract
We study the spectrum of massive excitations of the three-dimensional phi4 and Ising models, in the broken-symmetry phase. Using a variational method, we show that the spectrum contains all the 0+ states that one expects from duality with the glueball spectrum of the Z(2) gauge model. From the point of view of continuum phi4 theory, we show that at least one of the states we find has a non-perturbative origin.
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