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Affine Gaudin models and hypergeometric functions on affine opers

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JournalAdvances in Mathematics
DateAccepted/In press - 12 Apr 2019
DateE-pub ahead of print - 6 May 2019
DatePublished (current) - 9 Jul 2019
Volume350
Number of pages61
Pages (from-to)486-546
Early online date6/05/19
Original languageEnglish

Abstract

We conjecture that quantum Gaudin models in affine types admit families of higher Hamiltonians, labelled by the (countably infinite set of) exponents, whose eigenvalues are given by functions on a space of meromorphic opers associated with the Langlands dual Lie algebra. This is in direct analogy with the situation in finite types. However, in stark contrast to finite types, we prove that in affine types such functions take the form of hypergeometric integrals, over cycles of a twisted homology defined by the levels of the modules at the marked points. That result prompts the further conjecture that the Hamiltonians themselves are naturally expressed as such integrals. We go on to describe the space of meromorphic affine opers on an arbitrary Riemann surface. We prove that it fibres over the space of meromorphic connections on the canonical line bundle Ω. Each fibre is isomorphic to the direct product of the space of sections of the square of Ω with the direct product, over the exponents j not equal to 1, of the twisted cohomology of the jth tensor power of Ω.

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© 2019 Elsevier Inc. All rights reserved. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

    Research areas

  • Affine opers, Bethe ansatz, Gaudin model, Hypergeometric integrals

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