Remarks on critical points of phase functions and norms of Bethe vectors

Details Remarks on critical points of phase functions and norms of Bethe vectors Remarks on critical points of phase functions and norms of Bethe vectors

1998-10-14

arxiv.org/abs/math/9810087v1

Mathematics

Representation Theory

Scientific paper

We consider a tensor product of a Verma module and the linear representation of $sl(n+1)$. We prove that the corresponding phase function, which is used in the solutions of the KZ equation with values in the tensor product, has a unique critical point and show that the Hessian of the logarithm of the phase function at this critical point equals the Shapovalov norm of the corresponding Bethe vector.

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