Bethe Cycles, Frobenius Identities, and Quantum/Classical Duality
Peter Koroteev
Source abstract
We study Frobenius action on the trigonometric Ruijsenaars--Schneider system associated with cotangent bundles to complete flag varieties. The construction continues the program initiated by Etingof and Varchenko and developed in quantum -theory by the author and Smirnov. We explain how the monodromy eigenvectors recently constructed by Tarasov and Varchenko fit the quantum/classical duality between Bethe equations and tRS level sets. At a root of unity, all partial shifts cancel in the Newton--Adams combinations of the tRS Hamiltonians, leaving precisely the operators obtained by Frobenius action. This proves compatibility of the joint eigenvalue problem with Frobenius action in every rank and at every root order.
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