no. 2
A generalization of the Aleksandrov operator and adjoints of weighted composition operators
[Une généralisation de l’opérateur d’Aleksandrov, et les adjoints des opérateurs de composition à poids]
Gallardo-Gutiérrez, Eva A.1 ; Partington, Jonathan R.2
1 Universidad Complutense de Madrid e IUMA Facultad de Ciencias Matemáticas Departamento de Análisis Matemático Plaza de Ciencias 3 28040 Madrid (Spain)
2 University of Leeds School of Mathematics Leeds LS2 9JT, (U.K.)
Annales de l'Institut Fourier, Tome 63 (2013) no. 2, pp. 373-389.

On introduit une généralisation de l’opérateur d’Aleksandrov, afin de représenter l’adjoint d’un opérateur de composition à poids sur ℋ 2 par une intégrale selon une mesure. En particulier, nous montrons l’existence d’une famille de mesures qui représentent l’adjoint d’un opérateur de composition à poids, sous des hypothèses assez faibles. On discute l’unicité, et aussi la généralisation des mesures d’Aleksandrov–Clark, qui correspond au cas sans poids, c’est-à-dire au cas de l’adjoint des opérateurs de composition.

A generalization of the Aleksandrov operator is provided, in order to represent the adjoint of a weighted composition operator on ℋ 2 by means of an integral with respect to a measure. In particular, we show the existence of a family of measures which represents the adjoint of a weighted composition operator under fairly mild assumptions, and we discuss not only uniqueness but also the generalization of Aleksandrov–Clark measures which corresponds to the unweighted case, that is, to the adjoint of composition operators.

DOI : 10.5802/aif.2763
Classification : 47B33, 30D55
Keywords: Aleksandrov operator, Aleksandrov–Clark measures, Weighted composition operators
Mot clés : Opérateur d’Aleksandrov, Mesures d’Aleksandrov–Clark, Opérateur de composition à poids

Gallardo-Gutiérrez, Eva A. 1 ; Partington, Jonathan R. 2

1 Universidad Complutense de Madrid e IUMA Facultad de Ciencias Matemáticas Departamento de Análisis Matemático Plaza de Ciencias 3 28040 Madrid (Spain)
2 University of Leeds School of Mathematics Leeds LS2 9JT, (U.K.) 
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     title = {A generalization of the {Aleksandrov} operator and adjoints of weighted composition operators},
     journal = {Annales de l'Institut Fourier},
     pages = {373--389},
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Gallardo-Gutiérrez, Eva A.; Partington, Jonathan R. A generalization of the Aleksandrov operator and adjoints of weighted composition operators. Annales de l'Institut Fourier, Tome 63 (2013) no. 2, pp. 373-389. doi : 10.5802/aif.2763. https://aif.centre-mersenne.org/articles/10.5802/aif.2763/

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