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A \(\mathrm{Q}\)-operator for open spin chains. II: Boundary factorization. (English) Zbl 07845293

Summary: One of the features of Baxter’s \(\mathrm{Q}\)-operators for many closed spin chain models is that all transfer matrices arise as products of two \(\mathrm{Q}\)-operators with shifts in the spectral parameter. In the representation-theoretical approach to \(\mathrm{Q}\)-operators, underlying this is a factorization formula for \(\mathrm{L}\)-operators (solutions of the Yang-Baxter equation associated to particular infinite-dimensional representations). To extend such a formalism to open spin chains, one needs a factorization identity for solutions of the reflection equation (boundary Yang-Baxter equation) associated to these representations. In the case of quantum affine \(\mathfrak{sl}_{2}\) and diagonal \(\mathrm{K}\)-matrices, we derive such an identity using the recently formulated theory of universal \(\mathrm{K}\)-matrices for quantum affine algebras.
For Part I see [B. Vlaar and R. Weston, J. Phys. A, Math. Theor. 53, No. 24, Article ID 245205, 47 p. (2020; Zbl 1519.82035)].

MSC:

82B23 Exactly solvable models; Bethe ansatz
81R12 Groups and algebras in quantum theory and relations with integrable systems
16T15 Coalgebras and comodules; corings
82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics
81U15 Exactly and quasi-solvable systems arising in quantum theory
81Q80 Special quantum systems, such as solvable systems
81R50 Quantum groups and related algebraic methods applied to problems in quantum theory

Citations:

Zbl 1519.82035

References:

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