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Journal of Physics A Mathematical and General

Operator content of the Ashkin-Teller quantum chain, superconformal and Zamolodchikov-Fateev invariance. I. Free boundary conditions

Michael Baake, G von Gehlen, V. Rittenberg

Published Jun 1, 1987• 39 citations
Publisher

Abstract

Based on numerical analysis, the authors conjecture the operator content of the finite-size limit of the spectra of the Ashkin-Teller model with free boundary conditions. The same operator content is obtained from a Hamiltonian with a four-fermion interaction and a U(1) Kac-Moody Sugawara structure. For some special values of the coupling constant the model exhibits N=2 superconformal and Zamolodchikov-Fateev invariance. The operator content in these cases is expressed in terms of irreducible representations of the corresponding algebras.

DOI
10.1088/0305-4470/20/8/001

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Operator content of the Ashkin-Teller quantum chain, superconformal and Zamolodchikov-Fateev invariance. II. Boundary conditions compatible with the torus

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Operator content of the Ashkin-Teller quantum chain-superconformal and Zamolodchikov-Fateev invariance: I. Free boundary conditions

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Journal of Physics A Mathematical and General•Dec 1, 1987•0 citations

Operator content of the Ashkin-Teller quantum chain-superconformal and Zamolodchikov-Fateev invariance: II. Boundary conditions compatible with the torus

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Journal of Physics A Mathematical and General•Dec 1, 1987•0 citations
Based on numerical analysis, the authors conjecture the operator content of the finite-size limit of the spectra of the Ashkin-Teller model with free boundary conditions. The same operator content is obtained from a Hamiltonian with a four-fermion interaction and a U(1) Kac-Moody Sugawara structure. For some special values of the coupling constant the model exhibits N=2 superconformal and Zamolodchikov-Fateev invariance. The operator content in these cases is expressed in terms of irreducible representations of the corresponding algebras.
For pt. I, see ibid., vol. 20, no.8, p.L479-85 (1987). The authors present the operator content of the Ashkin-Teller quantum chain with eight boundary conditions corresponding to the eight elements of the group D 4 which gives the global symmetry of the system. This operator content is a conjecture based on an extensive numerical study and was proven to be correct at the Ising decoupling point. For the values of the coupling constant where N=2, superconformal invariance was seen for free boundary conditions. The situation is now more complex. One finds sectors which have N=2 and N=1 superconformal invariance and sectors which have no superconformal invariance at all. If, however, they combine the 'wrong' sectors of the spectra which correspond to two different values of the coupling constant, a new symmetry shows up. They also analyse the operator content at the Fateev-Zamolodchikov points. Here the 'wrong' sectors can be described by a few new primary fields.