Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-12-30
Nucl.Phys.B835:263-283,2010
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, Version published on Nucl.Phys. B; no formula changed, some references added together with Appendix B.
Scientific paper
10.1016/j.nuclphysb.2010.03.009
In [1], the spectrum (eigenvalues and eigenstates) of a lattice regularizations of the Sine-Gordon model has been completely characterized in terms of polynomial solutions with certain properties of the Baxter equation. This characterization for cyclic representations has been derived by the use of the Separation of Variables (SOV) method of Sklyanin and by the direct construction of the Baxter Q-operator family. Here, we reconstruct the Baxter Q-operator and the same characterization of the spectrum by only using the SOV method. This analysis allows us to deduce the main features required for the extension to cyclic representations of other integrable quantum models of this kind of spectrum characterization.
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