Semiclassical Limits of Quantum Affine Spaces

Semiclassical limits of generic multiparameter quantized coordinate rings A = Oq(k ) of affine spaces are constructed and related to A, for k an algebraically closed field of characteristic zero and q a multiplicatively antisymmetric matrix whose entries generate a torsionfree subgroup of k. A semiclassical limit of A is a Poisson algebra structure on the corresponding classical coordinate ring R = O(k), and results of Oh, Park, Shin and the authors are used to construct homeomorphisms from the Poisson prime and Poisson primitive spectra of R onto the prime and primitive spectra of A. The Poisson primitive spectrum of R is then identified with the space of symplectic cores in k in the sense of Brown and Gordon, and an example is presented (over C) for which the Poisson primitive spectrum of R is not homeomorphic to the space of symplectic leaves in k. Finally, these results are extended from quantum affine spaces to quantum affine toric varieties.