Vector-valued Littlewood-Paley-Stein theory for semigroups

Details Vector-valued Littlewood-Paley-Stein theory for semigroups Vector-valued Littlewood-Paley-Stein theory for semigroups

2005-05-14

arxiv.org/abs/math/0505303v1

Mathematics

Functional Analysis

To appear in Adv. Math

Scientific paper

We develop a generalized Littlewood-Paley theory for semigroups acting on $L^p$-spaces of functions with values in uniformly convex or smooth Banach spaces. We characterize, in the vector-valued setting, the validity of the one-sided inequalities concerning the generalized Littlewood-Paley-Stein $g$-function associated with a subordinated Poisson symmetric diffusion semigroup by the martingale cotype and type properties of the underlying Banach space. We show that in the case of the usual Poisson semigroup and the Poisson semigroup subordinated to the Ornstein-Uhlenbeck semigroup on ${\mathbb R}^n$, this general theory becomes more satisfactory (and easier to be handled) in virtue of the theory of vector-valued Calder\'on-Zygmund singular integral operators.

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