Weak type inequalities in noncommutative Lp-spaces

Abstract : The purpose of this thesis is to develop tools of noncommutative harmonic analysis. More precisely, it deals with noncommutative Khintchine inequalities and operator-valued singular integrals. The first part is dedicated to questions of interpolation between classical Lp-spaces. We generalize and state new characterisations of interpolation spaces between Lp-spaces. In a second part, we introduce a form of the noncommutative Khintchine inequalities which holds in every interpolation space between two Lp-spaces. It enables us to unify the cases p < 2 and p > 2 and to deal with weak Lp-spaces even when p = 1 or 2. By relying on the first part, we characterize spaces in which the usual formulas for Khintchine inequalities hold. In a last part, we give a simplified proof of the weak boundedness of noncommutative singular integrals, a result previously obtained by Parcet. This simplification allows us to recover quickly two results: the Lp pseudolocalisation and the weak type inequality for noncommutative singular integrals associated to Hilbert-valued kernels.
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Léonard Cadilhac. Weak type inequalities in noncommutative Lp-spaces. Algebraic Geometry [math.AG]. Normandie Université, 2019. English. ⟨NNT : 2019NORMC213⟩. ⟨tel-02356115⟩

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