Rankin-Cohen brackets and formal quantization

Details Rankin-Cohen brackets and formal quantization Rankin-Cohen brackets and formal quantization

2005-06-24

arxiv.org/abs/math/0506506v4

Mathematics

Quantum Algebra

21 pages, minor changes and typos corrected

Scientific paper

In this paper, we use the theory of deformation quantization to understand Connes' and Moscovici's results \cite{cm:deformation}. We use Fedosov's method of deformation quantization of symplectic manifolds to reconstruct Zagier's deformation \cite{z:deformation} of modular forms, and relate this deformation to the Weyl-Moyal product. We also show that the projective structure introduced by Connes and Moscovici is equivalent to the existence of certain geometric data in the case of foliation groupoids. Using the methods developed by the second author \cite{t1:def-gpd}, we reconstruct a universal deformation formula of the Hopf algebra $\calh_1$ associated to codimension one foliations. In the end, we prove that the first Rankin-Cohen bracket $RC_1$ defines a noncommutative Poisson structure for an arbitrary $\calh_1$ action.

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