Deriving Boundary S Matrices
High Energy Physics - Theory
2009-10-28 v1
Abstract
We show how to derive exact boundary matrices for integrable quantum field theories in 1+1 dimensions using lattice regularization. We do this calculation explicitly for the sine-Gordon model with fixed boundary conditions using the Bethe ansatz for an XXZ-type spin chain in a boundary magnetic field. Our results agree with recent conjectures of Ghoshal and Zamolodchikov, and indicate that the only solutions to the Bethe equations which contribute to the scaling limit are the standard strings.
Cite
@article{arxiv.hep-th/9402045,
title = {Deriving Boundary S Matrices},
author = {P. Fendley and H. Saleur},
journal= {arXiv preprint arXiv:hep-th/9402045},
year = {2009}
}
Comments
13 pages, USC-94-001