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2019 Generic colourful tori and inverse spectral transform for Hankel operators
Patrick Gérard, Sandrine Grellier
Tunisian J. Math. 1(3): 347-372 (2019). DOI: 10.2140/tunis.2019.1.347

Abstract

This paper explores the regularity properties of an inverse spectral transform for Hilbert–Schmidt Hankel operators on the unit disc. This spectral transform plays the role of action-angle variables for an integrable infinite dimensional Hamiltonian system: the cubic Szegő equation. We investigate the regularity of functions on the tori supporting the dynamics of this system, in connection with some wave turbulence phenomenon, discovered in a previous work and due to relative small gaps between the actions. We revisit this phenomenon by proving that generic smooth functions and a G δ dense set of irregular functions do coexist on the same torus. On the other hand, we establish some uniform analytic regularity for tori corresponding to rapidly decreasing actions which satisfy some specific property ruling out the phenomenon of small gaps.

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Patrick Gérard. Sandrine Grellier. "Generic colourful tori and inverse spectral transform for Hankel operators." Tunisian J. Math. 1 (3) 347 - 372, 2019. https://doi.org/10.2140/tunis.2019.1.347

Information

Received: 5 December 2017; Accepted: 11 May 2018; Published: 2019
First available in Project Euclid: 15 December 2018

zbMATH: 07027459
MathSciNet: MR3907744
Digital Object Identifier: 10.2140/tunis.2019.1.347

Subjects:
Primary: 35B65
Secondary: 37K15, 47B35

Rights: Copyright © 2019 Mathematical Sciences Publishers

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Vol.1 • No. 3 • 2019
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