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Asymptotic solutions to the sl_2 KZ equation and the intersection of Schubert classes

I. Scherbak
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Abstract

The hypergeometric solutions to the KZ equation contain a certain symmetric ``master function'', [SV]. Asymptotics of the solutions correspond to critical points of the master function and give Bethe vectors of the inhomogeneous Gaudin model, [RV]. The general conjecture is that the number of orbits of critical points equals the dimension of the relevant vector space, and that the Bethe vectors form a basis. In [ScV], a proof of the conjecture for the sl_2 KZ equation was given. The difficult part of the proof was to count the number of orbits of critical points of the master function. Here we present another, ``less technical'', proof based on a relation between the master function and the map sending a pair of polynomials into the Wronski determinant. Within these frameworks, the number of orbits becomes the intersection number of appropriate special Schubert classes. Application of the Schubert calculus to the sl_p KZ equation is discussed.

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I. Scherbak. 2002-09-03. Asymptotic solutions to the sl_2 KZ equation and the intersection of Schubert classes. https://arxiv.org/abs/math/0207218

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