Spectral extension of the quantum group cotangent bundle
arXiv:0812.2225 · doi:10.1007/s00220-009-0785-5
Abstract
The structure of a cotangent bundle is investigated for quantum linear groups GLq(n) and SLq(n). Using a q-version of the Cayley-Hamilton theorem we construct an extension of the algebra of differential operators on SLq(n) (otherwise called the Heisenberg double) by spectral values of the matrix of right invariant vector fields. We consider two applications for the spectral extension. First, we describe the extended Heisenberg double in terms of a new set of generators -- the Weyl partners of the spectral variables. Calculating defining relations in terms of these generators allows us to derive SLq(n) type dynamical R-matrices in a surprisingly simple way. Second, we calculate an evolution operator for the model of q-deformed isotropic top introduced by A.Alekseev and L.Faddeev. The evolution operator is not uniquely defined and we present two possible expressions for it. The first one is a Riemann theta function in the spectral variables. The second one is an almost free motion evolution operator in terms of logarithms of the spectral variables. Relation between the two operators is given by a modular functional equation for Riemann theta function.
38 pages, no figures
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- Heisenberg double H(B^*) as a braided commutative Yetter-Drinfeld module algebra over the Drinfeld double
- The -immanants and higher quantum Capelli identities
- Quantum su(n)_k monodromy matrices
- On construction of unitary quantum group differential calculus
- q-Casimir and q-cut-and-join operators related to Reflection Equation Algebras
- Generalized Yangians and their Poisson counterparts
- Yetter--Drinfeld structures on Heisenberg doubles and chains