Abstract
In this paper, we study the Cauchy problem for the Camassa–Holm equation in Sobolev spaces. Firstly, we establish the energy conservation for weak solutions of the Camassa–Holm equation in \(H^{1}(\mathbb {R})\cap B^{1}_{3,2}(\mathbb {R})\) and prove that every weak solution in \(H^{\frac{7}{6}}(\mathbb {R})\) is unique by the embedding \(H^{\frac{7}{6}}(\mathbb {R})\hookrightarrow B^{1}_{3,2}(\mathbb {R}).\) Then, we obtain the local well-posedness for the Camassa–Holm equation in \(W^{2,1}(\mathbb {R}).\) It is worth noting that \(B^{2}_{1,1}(\mathbb {R})\hookrightarrow W^{2,1}(\mathbb {R})\) and the Camassa–Holm equation is well-posed in \(B^{2}_{1,1}(\mathbb {R})\) and is ill-posed in \(W^{1+\frac{1}{p},p}(\mathbb {R})~(1<p\le \infty )\) by the pervious papers. Our result implies that \(W^{2,1}(\mathbb {R})\) is the critical Sobolev spaces for the well-posedness of the Camassa–Holm equation.
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We would like to express our gratitude to the editorial board, reviewers and funding institutions mentioned above.
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Guo was supported by the National Natural Science Foundation of China (No. 12161004), the Basic and Applied Basic Research Foundation of Guangdong Province (No. 2020A1515111092) and Research Fund of Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano-Optoelectronic Technology (No. 2020B1212030010). Ye was supported by the general project of Natural Science Foundation of Guangdong Province (No. 2021A1515010296).
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Both Guo and Ye designed research and performed research. Guo wrote the main manuscript text and Ye checked the manuscript. All authors reviewed the manuscript.
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Guo, Y., Ye, W. Energy conservation and well-posedness of the Camassa–Holm equation in Sobolev spaces. Z. Angew. Math. Phys. 74, 184 (2023). https://doi.org/10.1007/s00033-023-02081-y
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DOI: https://doi.org/10.1007/s00033-023-02081-y