Paper detail

Fréchet algebraic deformation quantization of the Poincaré disk

Starting from formal deformation quantization we use an explicit formula for a star product on the Poincaré disk D_n to introduce a Fréchet topology making the star product continuous. To this end a general construction of locally convex topologies on algebras with countable vector space basis is introduced and applied. Several examples of independent interest are investigated as e.g. group algebras over finitely generated groups and infinite matrices. In the case of the star product on D_n the resulting Fréchet algebra is shown to have many nice features: it is a strongly nuclear Köthe space, the symmetry group SU(1, n) acts smoothly by continuous automorphisms with an inner infinitesimal action, and evaluation functionals at all points of D_n are continuous positive functionals.