Hopf-algebraic deformations of products and Wick polynomials

International audienceWe present a different approach to classical definitions and results on cumulant-moment relations and Wick polynomials, which is based on extensive use of convolution products of linear functionals on a coalgebra. It allows, in particular, to understand the construction of Wick polynomials as the result of a Hopf algebra deformation under the action of linear automorphisms induced by multivariate moments associated to an arbitrary family of random variables with moments at all orders