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15 June 2018 Universal dynamics for the defocusing logarithmic Schrödinger equation
Rémi Carles, Isabelle Gallagher
Duke Math. J. 167(9): 1761-1801 (15 June 2018). DOI: 10.1215/00127094-2018-0006

Abstract

We consider the Schrödinger equation with a logarithmic nonlinearity in a dispersive regime. We show that the presence of the nonlinearity affects the large time behavior of the solution: the dispersion is faster than usual by a logarithmic factor in time, and the positive Sobolev norms of the solution grow logarithmically in time. Moreover, after rescaling in space by the dispersion rate, the modulus of the solution converges to a universal Gaussian profile. These properties are suggested by explicit computations in the case of Gaussian initial data and remain when an extra power-like nonlinearity is present in the equation. One of the key steps of the proof consists in working in hydrodynamical variables to reduce the equation to a variant of the isothermal compressible Euler equation, whose large time behavior turns out to be governed by a parabolic equation involving a Fokker–Planck operator.

Citation

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Rémi Carles. Isabelle Gallagher. "Universal dynamics for the defocusing logarithmic Schrödinger equation." Duke Math. J. 167 (9) 1761 - 1801, 15 June 2018. https://doi.org/10.1215/00127094-2018-0006

Information

Received: 23 March 2017; Revised: 15 January 2018; Published: 15 June 2018
First available in Project Euclid: 16 May 2018

zbMATH: 06904639
MathSciNet: MR3813596
Digital Object Identifier: 10.1215/00127094-2018-0006

Subjects:
Primary: 35Q55
Secondary: 35Q40

Rights: Copyright © 2018 Duke University Press

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Vol.167 • No. 9 • 15 June 2018
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