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In this note we investigate Liouville type theorems for the steady three dimensional MHD and Hall-MHD equations, and show that the velocity field $u$ and the magnetic field $B$ are vanishing provided that $B\in L^{6,\infty}(\mathbb{R}^3)$…

偏微分方程分析 · 数学 2022-01-05 Xiaomeng Chen , Shuai Li , Wendong Wang

This paper solves the global conormal regularity problem for the three-dimensional incompressible MHD equations with slip boundary condition near a background magnetic field. Motivated by applications in geophysics, the MHD system…

偏微分方程分析 · 数学 2025-07-01 Jincheng Gao , Jiahong Wu , Zheng-an Yao , Xuan Yin

We study the global well-posedness and asymptotic behavior of solutions for the Cauchy problem of three-dimensional sixth order Cahn-Hilliard equation arising in oil-water-surfactant mixtures. First, by using the pure energy method and a…

偏微分方程分析 · 数学 2020-07-15 Xiaopeng Zhao

This paper resolves the global regularity problem for the three-dimensional incompressible magnetohydrodynamics (MHD) equations in the upper half-space with slip boundary conditions, in the presence of a background magnetic field. Motivated…

偏微分方程分析 · 数学 2025-08-14 Jincheng Gao , Lianyun Peng , Jiahong Wu , Zheng-an Yao

It is well known that the three-dimensional ideal magnetohydrodynamics (MHD) equations possess three magnetic invariants: (M) magnetic helicity, (C) cross helicity, and (P) the mean-square magnetic potential, in addition to the fundamental…

数学物理 · 物理学 2025-11-20 Naoki Sato , Ken Abe , Michio Yamada

This paper establishes the global existence and uniqueness of smooth solutions to the two-dimensional compressible magnetohydrodynamic system when the initial data is close to an equilibrium state. In addition, explicit large-time decay…

偏微分方程分析 · 数学 2017-03-31 Jiahong Wu , Yifei Wu

We consider the Cauchy problem with smooth and compactly supported initial data for the wave equation in a general class of spherically symmetric geometries which are globally smooth and asymptotically flat. Under certain mild conditions on…

广义相对论与量子宇宙学 · 物理学 2011-06-23 Matthew P. Masarik

In this paper we study the initial-boundary value problem for the magnetohydrodynamic system in three dimensional exterior domain. We show an existence theorem of global in time strong solution for small initial data and we also show its…

偏微分方程分析 · 数学 2016-09-07 Norikazu Yamaguchi

We propose the generally covariant action for the theory of a self-coupled complex scalar field and electromagnetism which by virtue of constraints is equivalent, in the regime of long wavelengths, to perfect magnetohydrodynamics (MHD). We…

广义相对论与量子宇宙学 · 物理学 2008-11-26 Jacob D. Bekenstein , Gerold Betschart

In this paper, we consider the Cauchy problem for semi-linear wave equations with structural damping term $\nu (-\Delta)^2 u_t$, where $\nu >0$ is a constant. As being mentioned in [8,10], the linear principal part brings both the diffusion…

偏微分方程分析 · 数学 2021-02-11 Tuan Anh Dao , Hiroshi Takeda

The Cauchy problem for the classical Dirac-Klein-Gordon system in two space dimensions is globally well-posed for L^2 Schoedinger data and wave data in H^{1/2} \times H^{-1/2}. In the case of smooth data there exists a global smooth…

偏微分方程分析 · 数学 2009-06-22 Axel Gruenrock , Hartmut Pecher

We study the Cauchy problem for a system of equations corresponding to a singular limit of radiative hydrodynamics, namely the 3D radiative compressible Euler system coupled to an electromagnetic field. Assuming smallness hypotheses for the…

偏微分方程分析 · 数学 2017-05-23 Xavier Blanc , Bernard Ducomet , Sarka Necasova

In this paper, we study the forward self-similar solutions to the three-dimensional Magnetohydrodynamic equations (MHD equations) in the whole space. By employing the Leray-Schauder theorem and blow-up argument, we construct a global-time…

偏微分方程分析 · 数学 2025-03-18 Yifan Yang

We investigate a theoretical MHD disc problem involving a composite disc system of gravitationally coupled stellar and gaseous discs with a coplanar magnetic field in the presence of an axisymmetric dark matter halo. The two discs are…

天体物理学 · 物理学 2009-11-11 Yu-Qing Lou , Xue-Ning Bai

In this paper, we are concerned with global existence and optimal decay rates of solutions for the three-dimensional compressible Hall-MHD equations. First, we prove the global existence of strong solutions by the standard energy method…

偏微分方程分析 · 数学 2015-05-05 Jincheng Gao , Zheng-an Yao

The extended magnetohydrodynamics (MHD) system, including the Hall effect and the electron inertia effect, has a Hamiltonian structure embodied by a noncanonical Poisson algebra on an infinite-dimensional phase space. A nontrivial part of…

等离子体物理 · 物理学 2015-06-11 Hamdi M. Abdelhamid , Yohei Kawazura , Zensho Yoshida

The motion of a fully ionized plasma of electrons and ions is generally governed by the Vlasov-Maxwell-Landau system. We prove the global existence of solutions near Maxwellians to the Cauchy problem of the system for the long-range…

偏微分方程分析 · 数学 2012-05-25 Renjun Duan

In this paper, we consider the Cauchy problem for the one-dimensional compressible isentropic magnetohydrodynamic (MHD) equations with no vacuum at infinity, but the initial vacuum can be permitted inside the region. By deriving a priori…

偏微分方程分析 · 数学 2021-02-08 Zilai Li , Huaqiao Wang , Yulin Ye

This Chapter outlines the basic properties of waves in solar partially ionized plasmas. It provides a summary of the main sets of equations, from the single-fluid formalism, to the multi-fluid one, giving examples for purely hydrogen, and…

太阳与恒星天体物理 · 物理学 2024-09-19 Elena Khomenko , David Martínez-Gómez

We discover cancellations upon $H^{2}(\mathbb{R}^{n})$-estimate of the Hall term for $n \in \{2,3\}$. As its consequence, first, we derive a regularity criterion for the 3-dimensional Hall-magnetohydrodynamics system in terms of only…

偏微分方程分析 · 数学 2023-02-08 Mohammad Mahabubur Rahman , Kazuo Yamazaki