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.
Authors
- Kenneth Hvistendahl Karlsen (ORCID: https://orcid.org/0000-0003-3375-2084)
- Yan Rybalko (ORCID: https://orcid.org/0000-0001-5548-846X)
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
Funders
- European Commission
- Norges Forskningsråd
- HORIZON EUROPE Framework Programme
- HORIZON EUROPE Marie Sklodowska-Curie Actions