Low regularity conservation laws for Fokas-Lenells equation and Camassa-Holm equation

In this article, we mainly prove low regularity conservation laws for the Fokas-Lenells equation in Besov spaces with small initial data both on the line and on the circle. We develop a new technique in Fourier analysis and complex analysis to obtain the estimates. It is based on the perturbation de...

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Bibliographic Details
Published in:Advances in nonlinear analysis 2024-06, Vol.13 (1), p.137-151
Main Authors: Shan, Minjie, Chen, Mingjuan, Lu, Yufeng, Wang, Jing
Format: Article
Language:English
Subjects:
35Q55
37K10
Camassa-Holm equation
conservation law
Fokas-Lenells equation
perturbation determinant
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Summary:In this article, we mainly prove low regularity conservation laws for the Fokas-Lenells equation in Besov spaces with small initial data both on the line and on the circle. We develop a new technique in Fourier analysis and complex analysis to obtain the estimates. It is based on the perturbation determinant associated with the Lax pair introduced by Killip, Vişan, and Zhang for completely integrable dispersive partial differential equations. Additionally, we also utilize the perturbation determinant to derive the global estimates for the Schwartz solutions to the Camassa-Holm (CH) equation in . Even though the energy conservation law of the CH equation is a fact known to all, the perturbation determinant method indicates that we cannot get any conserved quantities for the CH equation in except
ISSN:2191-950X
DOI:10.1515/anona-2024-0014