paper

Scalar products and norm of Bethe vectors in invariant integrable models

arXiv:2503.01578 · doi:10.21468/SciPostPhys.19.1.023

Abstract

We compute scalar products of off-shell Bethe vectors in models with symmetry. The scalar products are expressed as a sum over partitions of the Bethe parameter sets, the building blocks being the so-called highest coefficients. We prove some recurrence relations and a residue theorem for these highest coefficients, and prove that they are consistent with the reduction to invariant models. We also express the norm of on-shell Bethe vectors as a Gaudin determinant.

38 pages; introduction improved nd conclusion added; more explanations on the gl(n) reduction

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