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Separation of variables and scalar products at any rank

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arxiv 1907.03788 v2 pith:FBVYT35W submitted 2019-07-08 hep-th cond-mat.stat-mechmath-phmath.MPmath.QAnlin.SI

classification hep-thcond-mat.stat-mechmath-phmath.MPmath.QAnlin.SI
keywords measurerankformintegrablemodelsscalarseparationvariables
verification ladder T0 review T1 audit T2 compute T3 formal
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Separation of variables (SoV) is a special property of integrable models which ensures that the wavefunction has a very simple factorised form in a specially designed basis. Even though the factorisation of the wavefunction was recently established for higher rank models by two of the authors and G. Sizov, the measure for the scalar product was not known beyond the case of rank one symmetry. In this paper we show how this measure can be found, bypassing an explicit SoV construction. A key new observation is that the measure for spin chains in a highest-weight infinite dimensional representation of sl(N) couples Q-functions at different nesting levels in a non-symmetric fashion. We also managed to express a large number of form factors as ratios of determinants in our new approach. We expect our method to be applicable in a much wider setup including the problem of computing correlators in integrable CFTs such as the fishnet theory, N=4 SYM and the ABJM model.

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Cited by 4 Pith papers

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  1. Yangian symmetry, GKZ equations and integrable Feynman graphs in conformal variables

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    Yangian-invariant conformal Feynman integrals satisfy a general cross-ratio PDE system that for a class of graphs is exactly a GKZ hypergeometric system.

  2. The Holographic Dual of Strongly \gamma-deformed N=4 SYM Theory: Derivation, Generalization, Integrability and Discrete Reparametrization Symmetry

    hep-th 2019-08 conditional novelty 7.0 of 10

    The authors extend the first-principles holographic derivation of the fishnet model to operators with magnons, present Baxter TQ equations for the full spectrum, and identify a discrete reparametrization symmetry.

  3. Probing Line Defect CFT with Mixed-Correlator Bootstrability

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    Using mixed-correlator bootstrability with parity and localization input, this paper produces new finite-coupling bounds on 12 OPE coefficients and a new exact BPS structure constant for the Maldacena-Wilson line defect CFT.

  4. On Complex Gamma-Function Integrals

    math-ph 2019-08 conditional novelty 6.0 of 10

    Two complex gamma-function integral identities are proved directly and shown to imply star-triangle relations and the Dotsenko-Fateev duality in a classical limit.

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