Maximal theorems and square functions for analytic operators on Lp-spaces

Details Maximal theorems and square functions for analytic operators on Lp-spaces Maximal theorems and square functions for analytic operators on Lp-spaces

2010-11-05

arxiv.org/abs/1011.1360v1

Mathematics

Functional Analysis

Scientific paper

Let T : Lp --> Lp be a contraction, with p strictly between 1 and infinity, and assume that T is analytic, that is, there exists a constant K such that n\norm{T^n-T^{n-1}} < K for any positive integer n. Under the assumption that T is positive (or contractively regular), we establish the boundedness of various Littlewood-Paley square functions associated with T. As a consequence we show maximal inequalities of the form $\norm{\sup_{n\geq 0}\, (n+1)^m\bigl |T^n(T-I)^m(x) \bigr |}_p\,\lesssim\, \norm{x}_p$, for any nonnegative integer m. We prove similar results in the context of noncommutative Lp-spaces. We also give analogs of these maximal inequalities for bounded analytic semigroups, as well as applications to R-boundedness properties.

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