Wednesday, 7 May 2008

noncommutative geometry - Kontsevich, and Geometric, Quantization and the Podles sphere

There exist a large family of noncommutative spaces that arise from the quantum matrices. These algebraic objects q-deform the coordinate rings of certain varieties. For example, take quantum SU(2), this is the algebra <a,b,c,d> quotiented by the ideal generated by
abqba,  acqca,  bccb,  bdqdb,  cdqdc,  adda(qq1)bc,


and the "q-det" relation
adqbc1

where q is some complex number. Clearly, when q=1 we get back the coordinate ring of SU(2). In the classical case S2=SU(2)/U(1) (the famous Hopf fibration). This generalises to the q-case: the U(1)-action generalises to a U(1)-coaction with an invariant subalgebra that q-deforms the coordinate algebra of S2 - the famous Podles sphere. There exist such q-matrix deformations of all flag manifolds.



Since all such manifolds are Kahler, we can also apply Kontsevich deformation to them to obtain a q-defomation. My question is: What is the relationship between these two approaches?



Alternatively, we can apply Kostant-Souriau geometric quantization to a flag manifold. How does alegbra relate to its q-matrix deformation?

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