COHOMOLOGIE DE HOCHSCHILD DES SURFACES DE KLEIN
Résumé
Given a physical system $(M,\,\mathcal{F}(M))$, where $M$ is a Poisson manifold and $\mathcal{F}(M)$ the algebra of regular functions on $M$, it is important to be able to quantize it to obtain righter results as the ones given by classical mechanics. An answer is provided with the deformation quantization, which consists in constructing a starproduct on the algebra of formal power series $\mathcal{F}(M)[[\hbar]]$. A first step toward study of starproducts is the calculation of Hochschild cohomology of $\mathcal{F}(M)$.\\ The aim of this article is to determine this Hochschild cohomology in the case of singular curves of the plan --- so we rediscover, by a different way, a result proved by Fronsdal and we precise it --- and in the case of Klein surfaces. The use of a complex suggested by Kontsevich and the help of Gröbner bases allow us to solve the problem.
Origine : Fichiers produits par l'(les) auteur(s)