Large amplitude traveling waves for the non-resistive MHD system
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910806363340800 |
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| author | Ciampa, Gennaro Montalto, Riccardo Terracina, Shulamit |
| author_facet | Ciampa, Gennaro Montalto, Riccardo Terracina, Shulamit |
| contents | We prove the existence of large amplitude bi-periodic traveling waves (stationary in a moving frame) of the two-dimensional non-resistive Magnetohydrodynamics (MHD) system with a traveling wave external force with large velocity speed $λ(ω_1, ω_2)$ and of amplitude of order $O(λ^{1^+})$ where $λ\gg 1$ is a large parameter. For most values of $ω= (ω_1, ω_2)$ and for $λ\gg 1$ large enough, we construct bi-periodic traveling wave solutions of arbitrarily large amplitude as $λ\to + \infty$. More precisely, we show that the velocity field is of order $O(λ^{0^+})$, whereas the magnetic field is close to a constant vector as $λ\to + \infty$. Due to the presence of small divisors, the proof is based on a nonlinear Nash-Moser scheme adapted to construct nonlinear waves of large amplitude. The main difficulty is that the linearized equation at any approximate solution is an unbounded perturbation of large size of a diagonal operator and hence the problem is not perturbative. The invertibility of the linearized operator is then performed by using tools from micro-local analysis and normal forms together with a sharp analysis of high and low frequency regimes w.r. to the large parameter $λ\gg 1$. To the best of our knowledge, this is the first result in which global in time, large amplitude solutions are constructed for the 2D non-resistive MHD system with periodic boundary conditions and also the first existence results of large amplitude quasi-periodic solutions for a nonlinear PDE in higher space dimension. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_17943 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Large amplitude traveling waves for the non-resistive MHD system Ciampa, Gennaro Montalto, Riccardo Terracina, Shulamit Analysis of PDEs 2020: 35Q35, 76W05, 35S50 We prove the existence of large amplitude bi-periodic traveling waves (stationary in a moving frame) of the two-dimensional non-resistive Magnetohydrodynamics (MHD) system with a traveling wave external force with large velocity speed $λ(ω_1, ω_2)$ and of amplitude of order $O(λ^{1^+})$ where $λ\gg 1$ is a large parameter. For most values of $ω= (ω_1, ω_2)$ and for $λ\gg 1$ large enough, we construct bi-periodic traveling wave solutions of arbitrarily large amplitude as $λ\to + \infty$. More precisely, we show that the velocity field is of order $O(λ^{0^+})$, whereas the magnetic field is close to a constant vector as $λ\to + \infty$. Due to the presence of small divisors, the proof is based on a nonlinear Nash-Moser scheme adapted to construct nonlinear waves of large amplitude. The main difficulty is that the linearized equation at any approximate solution is an unbounded perturbation of large size of a diagonal operator and hence the problem is not perturbative. The invertibility of the linearized operator is then performed by using tools from micro-local analysis and normal forms together with a sharp analysis of high and low frequency regimes w.r. to the large parameter $λ\gg 1$. To the best of our knowledge, this is the first result in which global in time, large amplitude solutions are constructed for the 2D non-resistive MHD system with periodic boundary conditions and also the first existence results of large amplitude quasi-periodic solutions for a nonlinear PDE in higher space dimension. |
| title | Large amplitude traveling waves for the non-resistive MHD system |
| topic | Analysis of PDEs 2020: 35Q35, 76W05, 35S50 |
| url | https://arxiv.org/abs/2401.17943 |