Sharp norm inequalities for commutators of classical operators
Cruz-Uribe, David (Trinity College. Department of Mathematics (Hartford, Estats Units))
Moen, Kabe (University of Alabama. Department of Mathematics)

Fecha:	2012
Resumen:	We prove several sharp weighted norm inequalities for commutators of classical operators in harmonic analysis. We found suffcient Ap-bump conditions on pairs of weights (u; v) such that [b; T], b 2 BMO and T a singular integral operator (such as the Hilbert or Riesz transforms), maps Lp(v) into Lp(u). Because of the added degree of singularity, the commutators require a \double log bump" as opposed to that of singular integrals, which only require single log bumps. For the fractional integral operator I we nd the sharp one-weight bound on [b; I ], b 2 BMO, in terms of the Ap;q constant of the weight. We also prove sharp two-weight bounds for [b; I ] analogous to those of singular integrals. We prove two-weight weak type inequalities for [b; T] and [b; I ] for pairs of factored weights. Finally we construct several examples showing our bounds are sharp.
Ayudas:	Ministerio de Ciencia e Innovación MTM2009-08934
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Commutators ; Two-weight inequalities ; Sharp weighted bounds
Publicado en:	Publicacions matemàtiques, Vol. 56, Núm. 1 ( 2012) , p. 147-190, ISSN 2014-4350

Adreça alternativa: https://raco.cat/index.php/PublicacionsMatematiques/article/view/248364
DOI: 10.5565/PUBLMAT_56112_06

44 p, 543.4 KB

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