Geometry of q-Hypergeometric Functions as a Bridge between Yangians and Quantum Affine Algebras

Details Geometry of q-Hypergeometric Functions as a Bridge between Yangians and Quantum Affine Algebras Geometry of q-Hypergeometric Functions as a Bridge between Yangians and Quantum Affine Algebras

1996-04-18

arxiv.org/abs/q-alg/9604011v4

Inventiones Mathematicae, 128 (1997), 501-588

Mathematics

Quantum Algebra

66 pages, amstex.tex (ver. 2.1) and amssym.tex are required; misprints are corrected

Scientific paper

10.1007/s002220050151

The rational quantized Knizhnik-Zamolodchikov equation (qKZ equation) associated with the Lie algebra $sl_2$ is a system of linear difference equations with values in a tensor product of $sl_2$ Verma modules. We solve the equation in terms of multidimensional $q$-hypergeometric functions and define a natural isomorphism between the space of solutions and the tensor product of the corresponding quantum group $U_q(sl_2)$ Verma modules, where the parameter $q$ is related to the step $p$ of the qKZ equation via $q=e^{pi i/p}$. We construct asymptotic solutions associated with suitable asymptotic zones and compute the transition functions between the asymptotic solutions in terms of the trigonometric $R$-matrices. This description of the transition functions gives a new connection between representation theories of Yangians and quantum loop algebras and is analogous to the Kohno-Drinfeld theorem on the monodromy group of the differential Knizhnik-Zamolodchikov equation. In order to establish these results we construct a discrete Gauss-Manin connection, in particular, a suitable discrete local system, discrete homology and cohomology groups with coefficients in this local system, and identify an associated difference equation with the qKZ equation.

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