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arXiv · 2610.38514

Nonlinear coercivity and orbital stability of smooth solitary waves for the modified Camassa--Holm equation

Xijun Deng·Ji Li·Zhisu Liu
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Abstract

In this paper, we establish orbital stability of smooth zero-background solitary waves for the modified Camassa--Holm equation in $H^1(\R)\cap W^{1,4}(\R)$ for the full range $γ<c<2γ$. The main difficulty is that spectral coercivity of the Hessian does not by itself yield nonlinear coercivity in this topology, because normalized perturbations may develop derivative concentration. In order to overcome this obstruction, we apply a penalized Lyapunov functional and introduce a derivative factorization. The key ingredient is a concentration-coercivity principle for the normalized Lyapunov energy, which yields local nonlinear Lyapunov coercivity. Our result extends the $H^1(\mathbb R)\cap W^{1,4}(\mathbb R)$ orbital-stability results of Li and Liu [Ann. PDE, 2021] and Zhang and Zhu [JDE, 2025] to the entire parameter range $γ<c<2γ$.

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Xijun Deng, Ji Li, Zhisu Liu. 2026-10-28. Nonlinear coercivity and orbital stability of smooth solitary waves for the modified Camassa--Holm equation. https://arxiv.org/abs/2610.38514

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