On the singular nature of shallow-water convergence of the intermediate long wave equation on the real line
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866908850181898240 |
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| author | Chapouto, Andreia Harrop-Griffiths, Benjamin Li, Guopeng Oh, Tadahiro |
| author_facet | Chapouto, Andreia Harrop-Griffiths, Benjamin Li, Guopeng Oh, Tadahiro |
| contents | We investigate regularity properties of the solution map for the intermediate long wave equation (ILW) on the real line. More precisely, we study the scaled ILW which was shown to converge to the Korteweg-de Vries equation (KdV) in $L^2(\mathbb R)$ in the shallow-water limit in a recent work by the first, third, and fourth authors with T. Zhao (2025). By decomposing the dynamics into the low frequency part and the residual part, we show that, when the depth parameter is sufficiently small, the solution map for the low frequency part is analytic in $L^2(\mathbb R)$, while the solution map for the residual part fails to be $C^2$. Moreover, we establish shallow-water convergence in $L^2(\mathbb R)$ of the low frequency dynamics to KdV. This explains the mechanism of the regularity gain of the solution map in the shallow-water limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_20695 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | On the singular nature of shallow-water convergence of the intermediate long wave equation on the real line Chapouto, Andreia Harrop-Griffiths, Benjamin Li, Guopeng Oh, Tadahiro Analysis of PDEs 35Q35, 35Q53, 76B55 We investigate regularity properties of the solution map for the intermediate long wave equation (ILW) on the real line. More precisely, we study the scaled ILW which was shown to converge to the Korteweg-de Vries equation (KdV) in $L^2(\mathbb R)$ in the shallow-water limit in a recent work by the first, third, and fourth authors with T. Zhao (2025). By decomposing the dynamics into the low frequency part and the residual part, we show that, when the depth parameter is sufficiently small, the solution map for the low frequency part is analytic in $L^2(\mathbb R)$, while the solution map for the residual part fails to be $C^2$. Moreover, we establish shallow-water convergence in $L^2(\mathbb R)$ of the low frequency dynamics to KdV. This explains the mechanism of the regularity gain of the solution map in the shallow-water limit. |
| title | On the singular nature of shallow-water convergence of the intermediate long wave equation on the real line |
| topic | Analysis of PDEs 35Q35, 35Q53, 76B55 |
| url | https://arxiv.org/abs/2602.20695 |