paper

On exact overlaps for symmetric spin chains

arXiv:2110.07960 · doi:10.1016/j.nuclphysb.2022.115909

Abstract

We study the integrable two-site states of the quantum integrable models solvable by the nested algebraic Bethe ansatz and possessing -invariant R-matrix. We investigate the overlaps between the integrable two-site states and the wave-functions. To find exact derivations for the factorized overlap formulas for the nested integrable systems is a longstanding unsolved problem. In this paper we give a derivation for a large class of the integrable states of the symmetric spin chain. The first part of the derivation is to calculate recurrence relations for the off-shell overlap that uniquely fix it. Using these recursions we prove that the normalized overlaps of the multi-particle states have factorized forms which contain the products of the one-particle overlaps and the ratio of the Gaudin-like determinants. We also show that the previously proposed overlap formulas agree with our general formula.

79 pages, accepted version (Nucl.Phys.B)

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