Geodesic
Expectation values of scaling fields in $Z_N$ Ising models
Teoretičeskaâ i matematičeskaâ fizika, Tome 154 (2008) no. 3, pp. 557-583

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We compute exact vacuum expectation values of physically relevant scaling fields in the perturbed $Z_N$ parafermionic models. Our algebraic method is based on analyzing vertex operators in the corresponding off-critical lattice model. The results coincide with the expressions derived by perturbed conformal field theory methods.
Keywords: integrable model, conformal field theory, vacuum expectation value, parafermionic symmetry, vertex operator. 
@article{TMF_2008_154_3_a8,
     author = {V. A. Fateev and Ya. P. Pugay},
     title = {Expectation values of scaling fields in $Z_N$ {Ising} models},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {557--583},
     publisher = {mathdoc},
     volume = {154},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2008_154_3_a8/}
}
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V. A. Fateev; Ya. P. Pugay. Expectation values of scaling fields in $Z_N$ Ising models. Teoretičeskaâ i matematičeskaâ fizika, Tome 154 (2008) no. 3, pp. 557-583. http://geodesic.mathdoc.fr/item/TMF_2008_154_3_a8/