Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-12-20
Nucl.Phys. B525 (1998) 641-663
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, LaTeX 2e, 8 figures, uses epsf, amssymb, cite. Revised version: explanations expanded, normalisation of the boundary
Scientific paper
10.1016/S0550-3213(98)00339-3
We study the spectrum of the scaling Lee-Yang model on a finite interval from two points of view: via a generalisation of the truncated conformal space approach to systems with boundaries, and via the boundary thermodynamic Bethe ansatz. This allows reflection factors to be matched with specific boundary conditions, and leads us to propose a new (and non-minimal) family of reflection factors to describe the one relevant boundary perturbation in the model. The equations proposed previously for the ground state on an interval must be revised in certain regimes, and we find the necessary modifications by analytic continuation. We also propose new equations to describe excited states, and check all equations against boundary truncated conformal space data. Access to the finite-size spectrum enables us to observe boundary flows when the bulk remains massless, and the formation of boundary bound states when the bulk is massive.
Dorey Patrick
Pocklington Andrew
Tateo Roberto
Watts Gerard
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