Auxiliary matrices on both sides of the equator

Details Auxiliary matrices on both sides of the equator Auxiliary matrices on both sides of the equator

2004-08-12

arxiv.org/abs/math-ph/0408023v2

J.Phys. A38 (2005) 47-66

Physics

Mathematical Physics

22 pages; 2nd version: one paragraph added in the conclusion and some typos corrected

Scientific paper

10.1088/0305-4470/38/1/003

The spectra of previously constructed auxiliary matrices for the six-vertex model at roots of unity are investigated for spin-chains of even and odd length. The two cases show remarkable differences. In particular, it is shown that for even roots of unity and an odd number of sites the eigenvalues contain two linear independent solutions to Baxter's TQ-equation corresponding to the Bethe ansatz equations above and below the equator. In contrast, one finds for even spin-chains only one linear independent solution and complete strings. The other main result is the proof of a previous conjecture on the degeneracies of the six-vertex model at roots of unity. The proof rests on the derivation of a functional equation for the auxiliary matrices which is closely related to a functional equation for the eight-vertex model conjectured by Fabricius and McCoy.

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