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TBA and TCSA with boundaries and excited states

Dorey, P., Pocklington, Andrew ORCID:, Tateo, R. and Watts, G. 1998. TBA and TCSA with boundaries and excited states. Nuclear Physics B 525 (3) , pp. 641-663. 10.1016/S0550-3213(98)00339-3

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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. (C) 1998 Elsevier Science B.V.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Subjects: Q Science > QC Physics
Publisher: Elsevier
ISSN: 0550-3213
Last Modified: 31 Oct 2022 09:55

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