One-point functions in perturbed boundary conformal field theories

Details One-point functions in perturbed boundary conformal field theories One-point functions in perturbed boundary conformal field theories

2000-07-10

arxiv.org/abs/hep-th/0007077v1

Nucl.Phys. B594 (2001) 625-659

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 34 pages, 16 figures

Scientific paper

10.1016/S0550-3213(00)00622-2

We consider the one-point functions of bulk and boundary fields in the scaling Lee-Yang model for various combinations of bulk and boundary perturbations. The one-point functions of the bulk fields are analysed using the truncated conformal space approach and the form-factor expansion. Good agreement is found between the results of the two methods, though we find that the expression for the general boundary state given by Ghoshal and Zamolodchikov has to be corrected slightly. For the boundary fields we use thermodynamic Bethe ansatz equations to find exact expressions for the strip and semi-infinite cylinder geometries. We also find a novel off-critical identity between the cylinder partition functions of models with differing boundary conditions, and use this to investigate the regions of boundary-induced instability exhibited by the model on a finite strip.

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