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On the Free Boundary Problems for the Ideal Incompressible MHD Equations

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arxiv 2311.06581 v1 pith:HYC5WXVJ submitted 2023-11-11 math.AP math-phmath.MP

classification math.APmath-phmath.MP
keywords conditioninterfaceresultssurfacetensionequationsfieldsfree
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We investigate the general plasma-vacuum interface problems for the ideal incompressible MHD equations with or without surface tension and prove their nonlinear local well-posedness in standard Sobolev spaces under either non-zero surface tension or the stability condition that the magnetic fields are everywhere non-collinear on the interface. In particular, the results show that both capillary forces and tangential magnetic fields can stabilize the motion of the plasma-vacuum interfaces. Moreover, the vanishing surface tension limit results are established under the Rayleigh-Taylor sign condition or the non-collinearity condition. All these results hold with no graph assumption on the free interface.

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  1. Sharp well-posedness for the free boundary MHD equations

    math.AP 2024-12 conditional novelty 8.0 of 10

    Free boundary incompressible magnetohydrodynamics is shown to be well-posed at the sharp low-regularity scale s > d/2 + 1, with first uniqueness and smooth-solution construction results in a new state space.

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