A Coupled-Cluster Formulation of Hamiltonian Lattice Field Theory: The Nonlinear Sigma Model

We apply the coupled cluster method (CCM) to the Hamiltonian version of the latticisedO(4) nonlinear sigma model. The method, which was initially developed for the accurate description of quantum many-body systems, gives rise to two distinct approximation schemes. These approaches are compared with...

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Bibliographic Details
Published in:Annals of physics 1998-07, Vol.267 (1), p.97-133
Main Authors: Ligterink, N.E., Walet, N.R., Bishop, R.F.
Format: Article
Language:English
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Summary:We apply the coupled cluster method (CCM) to the Hamiltonian version of the latticisedO(4) nonlinear sigma model. The method, which was initially developed for the accurate description of quantum many-body systems, gives rise to two distinct approximation schemes. These approaches are compared with each other as well as with some other Hamiltonian approaches. Our study of both the ground state and collective excitations leads to indications of a possible chiral phase transition as the lattice spacing is varied.
ISSN:0003-4916
1096-035X
DOI:10.1006/aphy.1998.5812