Abstract:
The excitation spectrum in the quantum lattice sine-Gordon model
with Hamiltonian describing the interaction of two nearest
neighbors on a lattice is obtained. This lattice model is one of
the possible regularizations of the quantum field sine-Gordon
model that preserve the property of complete integrability. It is
shown that in the quantum field model regularized in this manner
there are phase transitions at the points γ=πn/(n+1)
(n is an integer), and these are explained by a change in the
structure of the vacuum state.
Citation:
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