Noncommutative Fourier Analysis on Invariant Subspaces: Frames of Unitary Orbits and Hilbert Modules over Group von Neumann Algebras

Autori

  • Davide Barbieri Universidad Autonoma de Madrid

DOI:

https://doi.org/10.6092/issn.2240-2829/6689

Parole chiave:

Frames, Group representations, Hilbert modules, Fourier analysis

Abstract

Lavoro in collaborazione con E. Hernández, J. Parcet e V. Paternostro. Discuteremo la struttura di basi e frames ottenute da orbite di rappresentazioni unitarie di gruppi discreti in sottospazi invarianti di spazi di Hilbert separabili. Tali spazi invarianti possono essere caratterizzati, attraverso intrallacciamenti, come moduli il cui anello dei coefficienti è dato dall'algebra di von Neumann del gruppo, e sono dotati inoltre di una mappa sesquilineare a valori in spazi di operatori di convoluzione densamente definiti, che definiscono una struttura di Hilbert. Si può mostrare che i frames e le basi associate a famiglie numerabili di orbite hanno una controparte in queste strutture di Hilbert, che ammettono sistemi riproducenti. Questi risultati estendono nozioni chiave di analisi di Fourier e wavelets a sistemi più generali che possono includere trasformazioni geometriche per gruppi cristallografici o rappresentazioni di gruppi di Heisenberg discreti.

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Pubblicato

2017-02-10

Come citare

Barbieri, D. (2016). Noncommutative Fourier Analysis on Invariant Subspaces: Frames of Unitary Orbits and Hilbert Modules over Group von Neumann Algebras. Bruno Pini Mathematical Analysis Seminar, 7(1), 36–52. https://doi.org/10.6092/issn.2240-2829/6689

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