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arXiv · 2606.28944

A Runge-type theorem by remote forcing for the linearized resistive MHD system

Mitsuo Higaki·Franck Sueur
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Abstract

In this paper, we study a quantitative Runge-type global approximation theorem for the linearized magnetohydrodynamic (MHD) system in bounded domains with arbitrary topology. In the context of magnetic relaxation, the interplay between the domain topology and magnetic field structure plays a crucial role. Recent studies illustrate a sharp contrast in the dynamics: while Enciso--Peralta-Salas (2025) highlights that the geometric complexity of magnetic fields acts as an obstruction to relaxation in non-resistive regimes, Kozono-Shimizu-Yanagisawa (2025) proves that in resistive regimes, the flow stably relaxes towards a harmonic equilibrium. Focusing on this resistive scenario, we adopt a control-theoretic viewpoint to quantitatively approximate the relaxation trajectory generated by the linearized initial-boundary value problem. Specifically, after decomposing the bounded-domain solution into the time-evolving part and the stationary part, we approximate it by a global solution on $\mathbb{R}^3$ under a remote forcing. An explicit dependence of the forcing cost on the approximation error is provided.

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Mitsuo Higaki, Franck Sueur. 2026-06-27. A Runge-type theorem by remote forcing for the linearized resistive MHD system. https://arxiv.org/abs/2606.28944

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