Generic regularity and Lipschitz metric for a two-component Novikov system

We investigate the Cauchy problem for a two-component generalization of the Novikov equation with cubic nonlinearity -- an integrable system whose solutions may develop strong nonlinear phenomena such as gradient blow-up and interactions between peakon-like structures. Our study has two main objectives: first, to analyze the generic regularity of global conservative solutions; and second, to construct a new metric that guarantees the Lipschitz continuity of the flow. Building on the geometric framework developed by Bressan and Chen for quasilinear second-order wave equations, we prove that the solution retains $C^k$ regularity away from a finite number of piecewise $C^{k-1}$ characteristic curves. Furthermore, we provide a description of the solution behavior in the vicinity of these curves. By introducing a Finsler norm on tangent vectors in the space of solutions, expressed in the transformed Bressan-Constantin variables, we introduce a Lipschitz metric representing the minimal energy transportation cost between two solutions.

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Publication Details

Journal
Journal of Differential Equations
Published
2026-11-09
DOI
https://doi.org/10.1016/j.jde.2026.114905
Primary Topic
Nonlinear Waves and Solitons
Type
article
Field-Weighted Citation Impact
0.00

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article

Generic regularity and Lipschitz metric for a two-component Novikov system

Kenneth Hvistendahl Karlsen, Yan Rybalko
1 links
Journal of Differential Equations
Nonlinear Waves and Solitons
article

Generic regularity and Lipschitz metric for a two-component Novikov system

Kenneth Hvistendahl Karlsen, Yan Rybalko
article en

Abstract

We investigate the Cauchy problem for a two-component generalization of the Novikov equation with cubic nonlinearity -- an integrable system whose solutions may develop strong nonlinear phenomena such as gradient blow-up and interactions between peakon-like structures. Our study has two main objectives: first, to analyze the generic regularity of global conservative solutions; and second, to construct a new metric that guarantees the Lipschitz continuity of the flow. Building on the geometric framework developed by Bressan and Chen for quasilinear second-order wave equations, we prove that the solution retains $C^k$ regularity away from a finite number of piecewise $C^{k-1}$ characteristic curves. Furthermore, we provide a description of the solution behavior in the vicinity of these curves. By introducing a Finsler norm on tangent vectors in the space of solutions, expressed in the transformed Bressan-Constantin variables, we introduce a Lipschitz metric representing the minimal energy transportation cost between two solutions.

Journal of Differential EquationsVol. 489
European Commission, Norges Forskningsråd, HORIZON EUROPE Framework Programme, HORIZON EUROPE Marie Sklodowska-Curie Actions
Nonlinear Waves and Solitons
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