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Form-factors in the Baxter–Bazhanov–Stroganov model I: norms and matrix elements

G von Gehlen1, N Iorgov2, S Pakuliak3,4, V Shadura2 and Yu Tykhyy2

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We continue our investigation of the {\bb Z}_N -Baxter–Bazhanov–Stroganov model using the method of separation of variables [1]. In this paper, we calculate the norms and matrix elements of a local {\bb Z}_N -spin operator between eigenvectors of the auxiliary problem. For the norm the multiple sums over the intermediate states are performed explicitly. In the case N = 2, we solve the Baxter equation and obtain form-factors of the spin operator of the periodic Ising model on a finite lattice.


PACS

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

02.10.Ud Linear algebra

02.30.Tb Operator theory

02.10.Yn Matrix theory

MSC

15A18 Eigenvalues, singular values, and eigenvectors

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs

Subjects

Mathematical physics

Statistical physics and nonlinear systems

Dates

Issue 47 (23 November 2007)

Received 3 September 2007

Published 6 November 2007



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