Dmitry Vorotnikov
We study initial-boundary value problems for the Lagrangian averaged alpha models for the equations of motion for the corotational Maxwell and inviscid fluids in 2D and 3D. We show existence of (global in time) dissipative solutions to these problems. We also discuss the idea of dissipative solution in an abstract Hilbert space framework.
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A basic model for describing plasma dynamics is given by the Euler-Maxwell system, in which compressible ion and electron fluids interact with their own self-consistent electromagnetic field. In this paper we consider the "one-fluid" Euler--Maxwell model for electrons, in 2 spatial dimensions, and prove global stability of a constant neutral background.
The fundamental "two-fluid" model for describing plasma dynamics is given by the Euler-Maxwell system, in which compressible ion and electron fluids interact with their own self-consistent electromagnetic field. We prove global stability of a constant neutral background, in the sense that irrotational, smooth and localized perturbations of a constant background with small amplitude lead to global smooth solutions in three space dimensions for the Euler-Maxwell system. Our construction applies equally well to other plasma models such as the Euler-Poisson system for two-fluids and a relativistic…
From the Maxwell-Schrödinger equation to the Euler-Maxwell equation in the semiclassical limit
该研究从麦克斯韦-薛定谔方程推导无压欧拉-麦克斯韦系统作为半经典极限，通过引入修正项的量子调制能量完成格朗沃尔估计，是首个避免正则化等的相关半经典极限结果。
The non-isentropic compressible Euler-Maxwell system is investigated in $R^3$ in the present paper, and the $L^q$ time decay rate for the global smooth solution is established. It is shown that the density and temperature of electron converge to the equilibrium states at the same rate $(1+t)^{-11/4}$ in $L^q$ norm.
In this paper, we consider the compressible Euler-Maxwell equations arising in semiconductor physics, which take the form of Euler equations for the conservation laws of mass density and current density for electrons, coupled to Maxwell's equations for self-consistent electromagnetic field. We study the global well-posedness in critical spaces and the limit to zero of some physical parameters in the scaled Euler-Maxwell equations. More precisely, using high- and low-frequency decomposition methods, we first construct uniform (global) classical solutions (around constant equilibrium) to the Cau…
The aim of this manuscript is to study the influence of the vorticity on the existence time in fluid systems for which global smoothness and decay is known in the case of small irrotational data. We focus on two examples: the Euler-Korteweg system and the two-fluid Euler Maxwell system. We prove that the lower bound of the lifespan of these systems is no less than the inverse of the $H^s$ $(s>5/2)$ norm of the rotational part of the initial velocity. Our approach is based on energy estimates and the fast time decay results of global solutions to these systems with small irrotational initial da…
In this paper we investigate the zero dielectric constant limit to the non-isentropic compressible Euler-Maxwell system. We justify this singular limit rigorously in the framework of smooth solutions and obtain the non-isentropic compressible magnetohydrodynamic equations as the dielectric constant tends to zero.
Global solutions of Euler-Maxwell equations with dissipation
该研究针对无离子背景的带阻尼Euler-Maxwell系统柯西问题，借鉴可压缩Euler系统相关研究方法，证明了满足色散条件的光滑初值下全局强解的存在唯一性及时间一致衰减性。
The bipolar non-isentropic compressible Euler-Maxwell system is investigated in $R^3$ in the present paper, and the $L^q$ time decay rate for the global smooth solution is established. It is shown that the total densities, total temperatures and magnetic field of two carriers converge to the equilibrium states at the same rate $(1+t)^{-3/2+3q/2}$ in $L^q$ norm. But, both the difference of densities and the difference of temperatures of two carriers decay at the rate $(1+t)^{-2-\frac{1}{q}}$, and the velocity and electric field decay at the rate $(1+t)^{-3/2+\frac{1}{2q}}$. This phenomenon on t…
We prove long-term regularity of solutions of the one-fluid Euler-Maxwell system in 3 spatial dimensions, in the case of small initial data with nontrivial vorticity.
The Euler-Maxwell system describes the evolution of a plasma when the collisions are important enough that each species is in a hydrodynamic equilibrium. In this paper we prove global existence of small solutions to this system set in the whole three-dimensional space, by combining the space-time resonance method, dispersive estimates, localization estimates and energy estimates. An important novelty is that we can prove a very slow growth of high derivatives even with a nonintegrable decay by reiterating the energy estimate.
Global convergence rates in the relaxation limits for the compressible Euler and Euler-Maxwell systems in Sobolev spaces
该研究针对可压缩Euler与Euler-Maxwell两类松弛系统，在Sobolev空间中结合新渐近展开方法与流函数技术，推导了不同初始数据情形下的全局收敛速率并证明强收敛性，给出时间一致误差估计。
Semi-classical limit of the massive Klein-Gordon-Maxwell system toward the relativistic Euler-Maxwell system via an adapted modulated energy method
本文通过适应性调制能量方法，研究了大规模克莱因-戈尔登-麦克斯韦系统在半经典极限下向相对论欧拉-麦克斯韦系统过渡的收敛性，并探讨了该系统与相对论大规模维拉夫-麦克斯韦方程的关系。
We consider the periodic problem for two-fluid non-isentropic Euler-Maxwell systems in plasmas. By means of suitable choices of symmetrizers and an induction argument on the order of the time-space derivatives of solutions in energy estimates, the global smooth solution with small amplitude is established near a non-constant equilibrium solution with asymptotic stability properties. This improves the results obtained in \cite{LWF16a} for models with temperature diffusion terms by using the pressure functions $p^ν$ in place of the unknown variables densities $n^ν$.
Convergence and non-convergence phenomena in Euler-Maxwell to MHD transitions
本文研究三维 Euler-Maxwell 系统与 MHD 系统的差异估计，通过系统分解证明了当光速趋于无穷大时流体速度与电磁场的收敛性及电流的非收敛性，并揭示了 L^2 能量流演化导致 Ampère 方程消失。
Green's function and Large time behavior for the 1-D compressible Euler-Maxwell system
本文研究了带松弛的一维可压缩 Euler-Maxwell 系统的 Green 函数与大时间行为，通过构造线性化系统的 Green 函数并结合能量估计，证明了非线性系统解的整体存在性与最优时间衰减率。
Approximations of Euler-Maxwell systems by drift-diffusion equations through zero-relaxation limits near non-constant equilibrium
本文研究非恒定平衡态附近 Euler-Maxwell 系统向带非恒定掺杂函数的漂移-扩散方程的零弛豫极限，借助一致估计、紧性、推广的流函数方法和归纳论证证明全局时间收敛与幂阶误差估计。
In this paper, we are concerned with the compressible Euler-Maxwell equations with a nonconstant background density (e.g. of ions) in three dimensional space. There exist stationary solutions when the background density is a small perturbation of a positive constant state. We first show the asymptotic stability of solutions to the Cauchy problem near the stationary state provided that the initial perturbation is sufficiently small. Moreover the convergence rates are obtained by combining the $L^p$-$L^q$ estimates for the linearized equations with time-weighted estimate.
We show that space-time resonances induce high-frequency Raman instabilities in the two-fluid Euler-Maxwell system describing laser-plasma interactions. A consequence is that the Zakharov WKB approximation to Euler-Maxwell is unstable for non-zero group velocities. A key step in the proof is the reformulation of the set of resonant frequencies as the locus of weak hyperbolicity for linearized equations around the WKB solution. We analyze those linearized equations with the symbolic flow method. Due to large transverse variations in the WKB profile, the equation satisfied by the symbolic flow a…
Dissipative hyperbolic systems of \textit{regularity-loss} have been recently received increasing attention. Usually, extra higher regularity is assumed to obtain the optimal decay estimates, in comparison with that for the global-in-time existence of solutions. In this paper, we develop a new frequency-localization time-decay property, which enables us to overcome the technical difficulty and improve the minimal decay-regularity for dissipative systems. As an application, it is shown that the optimal decay rate of $L^1(\mathbb{R}^3)$-$L^2(\mathbb{R}^3)$ is available for Euler-Maxwell equation…
We present an alpha-regularization of the Birkhoff-Rott equation, induced by the two-dimensional Euler-alpha equations, for the vortex sheet dynamics. We show that initially smooth self-avoiding vortex sheet remains smooth for all times under the alpha-regularized dynamics, provided the initial density of vorticity is an integrable function over the curve with respect to the arc-length measure.
An explicit expression is obtained for the sectional curvature in the plane spanned by two stationary flows, cos(k, x) and cos(l, x). It is shown that for certain values of the wave vectors k and l the curvature becomes positive for alpha > alpha_0, where 0 < alpha_0 < 1 is of the order 1/k. This suggests that the flow corresponding to such geodesics becomes more stable as one goes from usual Eulerian description to the Euler-alpha model.
Non-uniqueness for the compressible Euler-Maxwell equations
针对三维周期域内一般压力律下的等熵可压缩 Euler-Maxwell 方程，利用凸积分和 Mikado 势方法，构造出源于相同初始数据的无限多个 Hölder 连续熵解，证明了其解的非唯一性。
We present an alpha-regularization of the Birkhoff-Rott equation, induced by the two-dimensional Euler-alpha equations, for the vortex sheet dynamics. We show the convergence of the solutions of Euler-alpha equations to a weak solution of the Euler equations for initial vorticity being a finite Radon measure of fixed sign, which includes the vortex sheets case. We also show that, provided the initial density of vorticity is an integrable function over the curve with respect to the arc-length measure, (i) an initially Lipschitz chord arc vortex sheet (curve), evolving under the BR-alpha equatio…
The Euler-Maxwell system as a hydrodynamic model for plasma physics to describe the dynamics of the compressible electrons in a constant charged non-moving ion background is studied. The global smooth flow with small amplitude is constructed in three space dimensions when the electron velocity relaxation is present. The speed of the electrons flow trending to uniform equilibrium is obtained. The pointwise behavior of solutions to the linearized homogeneous system in the frequency space is also investigated in detail.
In this paper, we study the well-posedness in critical Besov spaces for two-fluid Euler-Maxwell equations, which is different from the one fluid case. We need to deal with the difficulties mainly caused by the nonlinear coupling and cancelation between two carriers. Precisely, we first obtain the local existence and blow-up criterion of classical solutions to the Cauchy problem and periodic problem pertaining to data in Besov spaces with critical regularity. Furthermore, we construct the global existence of classical solutions with aid of a different energy estimate (in comparison with the one…
Ill-Posedness of the Incompressible Euler--Maxwell Equations in the Yudovich Class
本文针对二维不可压缩Euler--Maxwell系统，证明了Yudovich类中适定性所需的Normal Structure条件是紧的，不满足该条件时系统不适定，结果适用于全平面与二维环面及任意正光速。
We study the large time behavior of solutions near a constant equilibrium to the compressible Euler-Maxwell system in $\r3$. We first refine a global existence theorem by assuming that the $H^3$ norm of the initial data is small, but the higher order derivatives can be arbitrarily large. If the initial data belongs to $\Dot{H}^{-s}$ ($0\le s<3/2$) or $\dot{B}_{2,\infty}^{-s}$ ($0<s\le3/2$), by a regularity interpolation trick, we obtain the various decay rates of the solution and its higher order derivatives. As an immediate byproduct, the usual $L^p$--$L^2$ $(1\le p\le 2)$ type of the decay r…
We first construct the global unique solution by assuming that the initial data is small in the $H^3$ norm but the higher order derivatives could be large. If further the initial data belongs to $\Dot{H}^{-s}$ ($0\le s<3/2$) or $\dot{B}_{2,\infty}^{-s}$ ($0< s\le3/2$), we obtain the various decay rates of the solution and its higher order derivatives. In particular, the decay rates of the density and temperature of electron could reach to $(1+t)^{-13/4}$ in $L^2$ norm.
Hydrodynamic limit and Newtonian limit from the relativistic Vlasov-Maxwell-Boltzmann system to the classical Euler-Poisson system
本文在经典等熵可压缩Euler-Poisson系统全局光滑无旋解附近，构造了单物种相对论性Vlasov-Maxwell-Boltzmann系统的经典解，并严格证明了流体极限和牛顿极限到Euler-Poisson系统的结合。
Incompressible Euler limit from the Boltzmann equation with Maxwell reflection boundary condition in the half-space
本文严格证明了半空间中具有麦克斯韦反射边界条件的玻尔兹曼方程在剪切流情形下的不可压缩欧拉极限，通过守恒律转化法向导数损失并利用解析框架建立一致估计。
A new characterization of the dissipation structure and the relaxation limit for the compressible Euler-Maxwell system
本文研究三维可压缩Euler-Maxwell系统，在临界正则性下证明经典解关于松弛参数一致的整体适定性，并通过将频率空间分为低、中、高三个区域刻画耗散结构，首次在非良备初值情形下得到向drift-diffusion模型的全局时间$O(\varepsilon)$强收敛。
Starting from the local-in-time classical solution to the compressible Euler system with impermeable boundary condition in half-space, by employing the coupled weak viscous layers (governed by linearized compressible Prandtl equations with Robin boundary condition) and linear kinetic boundary layers, and the analytical tools in \cite{Guo-Jang-Jiang-2010-CPAM} and some new boundary estimates both for Prandtl and Knudsen layers, we proved the local-in-time existence of Hilbert expansion type classical solutions to the scaled Boltzmann equation with Maxwell reflection boundary condition with acco…
We consider the $α$-Euler equations on a bounded three-dimensional domain with frictionless Navier boundary conditions. Our main result is the existence of a strong solution on a positive time interval, uniform in $α$, for $α$ sufficiently small. Combined with the convergence result in a previous article by the same authors, this implies convergence of solutions of the $α$-Euler equations to solutions of the incompressible Euler equations when $α\to 0$. In addition, we obtain a new result on local existence of strong solutions for the incompressible Euler equations on bounded three-dimensional…
Due to the dissipative structure of \textit{regularity-loss}, extra higher regularity than that for the global-in-time existence is usually imposed to obtain the optimal decay rates of classical solutions to dissipative systems. The aim of this paper is to seek the lowest regularity index for the optimal decay rate of $L^{1}(\mathbb{R}^n)$-$L^2(\mathbb{R}^n)$. Consequently, a notion of minimal decay regularity for dissipative systems of regularity-loss is firstly proposed. To do this, we develop a new time-decay estimate of $L^p(\mathbb{R}^n)$-$L^{q}(\mathbb{R}^n)$-$L^{r}(\mathbb{R}^n)$ type b…
The Fast Limit Model Associated With The Euler-Maxwell-Two-Fluid System
针对欧拉-麦克斯韦-双流体系统应用滤波方法得到快速极限模型（FLM），该模型能捕捉等离子体动力学中电子深度的基本特征，并扩展了XMHD框架，引入电场E参与时间演化。
We first construct the global unique solution by assuming that the initial data is small in the H^3 norm but its higher order derivatives could be large. If further the initial data belongs to \Dot{H}^{-s} (0\le s<3/2) or \dot{B}_{2,\infty}^{-s} (0< s\le3/2), we obtain the various decay rates of the solution and its higher order derivatives. As an immediate byproduct, the L^p-L^2 (1\le p\le 2) type of the decay rates follow without requiring the smallness for L^p norm of initial data. In particular, the decay rate for the difference of densities could reach to (1+t)^{-13/4} in L^2 norm.
The uniform existence time and Zero-Alpha limit problem of the Euler-Poincaré equations
研究Euler-Poincaré方程在色散参数$α$变化时的Cauchy问题，利用凸熵结构、修正交换子估计与Bona-Simth方法，证明一致存在时间并建立$α\to 0$时解在初始数据所在Sobolev空间中的收敛性。
In this article we consider weak solutions of the Euler-$α$ equations in the full plane. We take, as initial unfiltered vorticity, an arbitrary nonnegative, compactly supported, bounded Radon measure. Global well-posedness for the corresponding initial value problem is due M. Oliver and S. Shkoller. We show that, for all time, the support of the unfiltered vorticity is contained in a disk whose radius grows no faster than $\mathcal{O}((t\log t)^{1/4})$. This result is an adaptation of the corresponding result for the incompressible 2D Euler equations with initial vorticity compactly supported,…
Damped Strichartz estimates and the incompressible Euler--Maxwell system
本文研究不可压缩二维Euler–Maxwell方程组，证明在光速大于仅依赖初值的阈值时全局弱解存在唯一，并提出将阻尼效应纳入已有估计的抽象方法，得到改进的阻尼Strichartz估计。
Compressible Euler-Maxwell limit for global smooth solutions to the Vlasov-Maxwell-Boltzmann system
本文在只考虑电子动力学且初值近常数平衡的条件下，严格证明了 Vlasov-Maxwell-Boltzmann 系统光滑解在 Knudsen 数趋于零时收敛到可压缩 Euler-Maxwell 系统，并给出几乎全局时间区间上的显式收敛速率。
The incompressible limit of the Euler-Maxwell two-fluid system
本文通过过滤幺正群方法证明欧拉-麦克斯韦双流体系统不可压缩极限的调制方程存在性，为XMHD框架提供新基础，并揭示等离子体中多种现象的联系。
Charge-free well-posedness and charge-driven norm inflation for the Euler-Maxwell system
研究二维不可压缩 Euler-Maxwell 系统，发现投影无电荷系统在亚光速条件下具有局部适定性，而未投影系统中电荷密度导致涡量范数膨胀，揭示了高斯约束对正则性与膨胀的区分作用。
We prove the existence of global in time, finite energy, weak solutions to a quantum magnetohydrodynamic system (QMHD) with large data, modeling a charged quantum fluid interacting with a self-generated electromagnetic field. The analysis of QMHD relies upon the use of Madelung transformations. The rigorous derivation requires non-trivial smoothing estimates, which are obtained by assuming slightly higher regularity for the electromagnetic potential. These assumptions are motivated by the nonlinear dependence of the hydrodynamic system in terms of the underlying wave function dynamics, which i…
Polynomial tail solutions of the non-cutoff Boltzmann equation near local Maxwellians
本文将Caflisch分解融入玻尔兹曼宏微观分解，构造无截断玻尔兹曼方程在局部麦克斯韦分布附近的多项式尾解，设计新能量泛函得到ε^{1/2}量级扰动范数及常状态下全局存在性结果。
By using a set of scaling limits, the authors in \cite{ADFL,SS} proposed a framework of deriving the Hall-MHD equations from the two-fluids Euler-Maxwell equations for electrons and ions. In this paper, we derive the Hall-MHD equations from the Navier-Stokes-Maxwell equations with generalized Ohm's law in a mathematically rigorous way via the spectral analysis and energy methods.
The Global Well-posedness of the Euler-Poisson System for Ions in 2D
该研究针对二维离子Euler-Poisson方程组的全局适定性问题，借助为重力-毛细水波、Euler-Maxwell方程组开发的方法，解决低频时间共振与慢衰减带来的困难，建立相关全局适定性结果。
This paper continues the study of the validity of the Zakharov model describing Langmuir turbulence. We give an existence theorem for a class of singular quasilinear equations. This theorem is valid for well-prepared initial data. We apply this result to the Euler-Maxwell equations describing laser-plasma interactions, to obtain, in a high-frequency limit, an asymptotic estimate that describes solutions of the Euler-Maxwell equations in terms of WKB approximate solutions which leading terms are solutions of the Zakharov equations. Because of transparency properties of the Euler-Maxwell equatio…
Convergence of an implicit Euler Galerkin scheme for Poisson-Maxwell-Stefan systems
本文研究了隐式欧拉伽辽金格式在热力学一致的瞬态马克斯-斯蒂芬系统中的收敛性，重点在于处理电场相关的漂移项，并证明了该格式在质量和粒子密度非负性方面的守恒性。
This paper is concerned with the large-time behavior of solutions to the Cauchy problem on the two-fluid Euler-Maxwell system with collisions when initial data are around a constant equilibrium state. The main goal is the rigorous justification of diffusion phenomena in fluid plasma at the linear level. Precisely, motivated by the classical Darcy's law for the nonconductive fluid, we first give a heuristic derivation of the asymptotic equations of the Euler-Maxwell system in large time. It turns out that both the density and the magnetic field tend time-asymptotically to the diffusion equation…
In this paper, we study the hydrodynamic limits of both the Landau equation and the Vlasov-Maxwell-Landau system in the whole space. Our main purpose is two-fold: the first one is to give a rigorous derivation of the compressible Euler equations from the Landau equation via the Hilbert expansion; while the second one is to prove, still in the setting of Hilbert expansion, that the unique classical solution of the Vlasov-Maxwell-Landau system converges, which is shown to be globally in time, to the resulting global smooth solution of the Euler-Maxwell system, as the Knudsen number goes to zero.…
We consider the Euler-Voigt equations and the Navier-Stokes-Voigt equations, which are obtained by an inviscid alpha-regularization from the corresponding equations. The main result we show is the structural stability of the system in term of the variations of both viscosity of regularization parameters.
The semiclassical limit from the Pauli-Poisswell/Darwin to the Euler-Poisswell/Darwin system by WKB methods
本文通过 WKB 方法研究了从泡利-泊松威尔/达尔文到欧拉-泊松威尔/达尔文系统的 semiclassical 极限，证明了时间局部的 semiclassical 极限和弱收敛性，以及宏观密度的强收敛性。
Consider the relativistic Vlasov-Maxwell-Boltzmann system describing the dynamics of an electron gas in the presence of a fixed ion background. Thanks to recent works \cite{Germain-Masmoudi-ASENS-2014, Guo-Ionescu-Pausader-JMP-2014} and \cite{Deng-Ionescu-Pausader-ARMA-2017}, we establish the global-in-time validity of its Hilbert expansion and derive the limiting relativistic Euler-Maxwell system as the mean free path goes to zero. Our method is based on the $L^2-L^{\infty}$ framework and the Glassey-Strauss Representation of the electromagnetic field, with auxiliary $H^1$ estimate and $W^{1,…
Hilbert Expansion for Coulomb Collisional Kinetic Models
本文提出新的加权能量方法，证明r-VML系统与r-LAN方程的Hilbert展开有效，并在Knudsen数趋于零时严格建立其流体动力学极限。
We derive the incompressible Euler equations with heat convection with the no-penetration boundary condition from the Boltzmann equation with the diffuse boundary in the hydrodynamic limit for the scale of large Reynold number. Inspired by the recent framework in [30], we consider the Navier-Stokes-Fourier system with no-slip boundary conditions as an intermediary approximation and develop a Hilbert-type expansion of the Boltzmann equation around the global Maxwellian that allows the nontrivial heat transfer by convection in the limit. To justify our expansion and the limit, a new direct estim…
The fluid dynamic limit of the Boltzmann equation leading to the Euler equations for an incompressible fluid with constant density in the presence of material boundaries shares some important features with the better known inviscid limit of the Navier-Stokes equations. The present paper slightly extends recent results from [C. Bardos, F. Golse, L. Paillard, Comm. Math. Sci., 10 (2012), 159--190] to the case of boundary conditions for the Boltzmann equation more general than Maxwell's accomodation condition.
The convergence of solutions of the incompressible Navier-Stokes equations set in a domain with boundary to solutions of the Euler equations in the large Reynolds number limit is a challenging open problem both in 2 and 3 space dimensions. In particular it is distinct from the question of existence in the large of a smooth solution of the initial-boundary value problem for the Euler equations. The present paper proposes three results in that direction. First, if the solutions of the Navier-Stokes equations satisfy a slip boundary condition with vanishing slip coefficient in the large Reynolds …
We prove small data global existence and scattering for quasilinear systems of Klein-Gordon equations with different speeds, in dimension three. As an application, we obtain a robust global stability result for the Euler-Maxwell equations for electrons.
Large-time behavior of pressureless Euler--Poisson equations with background states
本文研究带可变背景态的一维阻尼无压 Euler–Poisson 系统，结合相平面分析与低强制性估计证明经典解收敛于平衡态，并应用于冷等离子体模型得到指数稳定性。
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