Infinitely many saturated travelling waves for a degenerate Fisher-KPP equation not in divergence form
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908607998590976 |
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| author | Alfaro, Matthieu Herda, Maxime Natale, Andrea |
| author_facet | Alfaro, Matthieu Herda, Maxime Natale, Andrea |
| contents | We consider an epidemic model with distributed-contacts. When the contact kernel concentrates, one formally reaches a very degenerate Fisher-KPP equation with a diffusion term that is not in divergence form. We make an exhaustive study of its travelling waves. For every admissible speed, there exist not only a unique non-saturated (smooth) wave but also infinitely many saturated (sharp) ones. Furthermore their tails may differ from what is usually expected. These results are thus in sharp contrast with their counterparts on related models. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_11589 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Infinitely many saturated travelling waves for a degenerate Fisher-KPP equation not in divergence form Alfaro, Matthieu Herda, Maxime Natale, Andrea Analysis of PDEs 35K65, 35C07, 92D30 We consider an epidemic model with distributed-contacts. When the contact kernel concentrates, one formally reaches a very degenerate Fisher-KPP equation with a diffusion term that is not in divergence form. We make an exhaustive study of its travelling waves. For every admissible speed, there exist not only a unique non-saturated (smooth) wave but also infinitely many saturated (sharp) ones. Furthermore their tails may differ from what is usually expected. These results are thus in sharp contrast with their counterparts on related models. |
| title | Infinitely many saturated travelling waves for a degenerate Fisher-KPP equation not in divergence form |
| topic | Analysis of PDEs 35K65, 35C07, 92D30 |
| url | https://arxiv.org/abs/2502.11589 |