Daniel Han-Kwan, Toan T. Nguyen, Frédéric Rousset
We study the linearized Vlasov-Poisson system around suitably stable homogeneous equilibria on $\mathbb{R}^d\times \mathbb{R}^d$ (for any $d \geq 1$) and establish dispersive $L^\infty$ decay estimates in the physical space.
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In this paper, we prove the nonlinear asymptotic stability of the Penrose-stable equilibria among solutions of the $2d$ Vlasov-Poisson system with massless electrons.
Equilibria for the Vlasov-Maxwell system related to plasma confinement
该研究针对等离子体约束相关的弗拉索夫-麦克斯韦方程组，在方位角与z方向不变的设定下简化其平衡态存在性问题，考虑z、θ、螺旋箍缩场景并给出半显式解，推进了相关平衡态的研究。
In this paper, we consider the linearized Vlasov-Poisson equation around an homogeneous Maxwellian equilibrium in a weakly collisional regime: there is a parameter $\eps$ in front of the collision operator which will tend to $0$. Moreover, we study two cases of collision operators, linear Boltzmann and Fokker-Planck. We prove a result of Landau damping for those equations in Sobolev spaces uniformly with respect to the collision parameter $\eps$ as it goes to $0$.
This paper is devoted to the linearized Vlasov-Poisson-Fokker-Planck system in presence of an external potential of confinement. We investigate the large time behaviour of the solutions using hypocoercivity methods and a notion of scalar product adapted to the presence of a Poisson coupling. Our framework provides estimates which are uniform in the diffusion limit. As an application in a simple case, we study the one-dimensional case and prove the exponential convergence of the nonlinear Vlasov-Poisson-Fokker-Planck system without any small mass assumption.
In this paper, we study the Vlasov-Navier-Stokes system in a 2D pipe with partially absorbing boundary conditions. We show the existence of stationary states for this system near small Poiseuille flows for the fluid phase, for which the kinetic phase is not trivial. We prove the asymptotic stability of these states with respect to appropriately compactly supported perturbations. The analysis relies on geometric control conditions which help to avoid any concentration phenomenon for the kinetic phase.
We revisit the proof of Landau damping near stable homogenous equilibria of Vlasov-Poisson systems with screened interactions in the whole space $\mathbb{R}^d$ (for $d\geq3$) that was first established by Bedrossian, Masmoudi and Mouhot. Our proof follows a Lagrangian approach and relies on precise pointwise in time dispersive estimates in the physical space for the linearized problem that should be of independent interest. This allows to cut down the smoothness of the initial data required in Bedrossian at al. (roughly, we only need Lipschitz regularity). Moreover, the time decay estimates we…
In this paper, we study the asymptotic stability of Penrose-stable equilibria among solutions of the screened Vlasov-Poisson system in $\mathbb{R}^d$ with $d\geq 3$ that was first established by Bedrossian, Masmoudi, and Mouhot in \cite{JBedrossian2018} with smooth initial data. More precisely, we prove the sharp decay estimates for the density of the perturbed system, exactly like the free transport with only Hölder (i.e., $C^{a}$ for $0<a<1$) perturbed initial data. This improves the recent works in \cite{HanKwanD2021} by Han-Kwan, Nguyen, and Rousset for lower derivatives of the density and…
On the stability of homogeneous equilibria in the Vlasov-Poisson system on $\mathbb{R}^3$
本文研究 $\mathbb{R}^3$ 中 Vlasov-Poisson 系统齐次平衡态的稳定性，统一处理一类解析平衡态并给出 Green 函数耗散率，同时回顾 Poisson 平衡态全局非线性渐近稳定性的近期结果。
We consider the Vlasov-Poisson system with initial data a small, radial, absolutely continuous perturbation of a point charge. We show that the solution is global and disperses to infinity via a modified scattering along trajectories of the linearized flow. This is done by an exact integration of the linearized equation, followed by the analysis of the perturbed Hamiltonian equation in action-angle coordinates.
Linear Landau damping for a two-species Vlasov-Poisson system for electrons and ions
本文研究电子与离子两物种Vlasov-Poisson系统在Penrose稳定平衡态附近的线性Landau阻尼，推广了单物种结果，证明电场能量指数衰减。
The asymptotic behavior of the solutions of the second order linearized Vlasov-Poisson system around homogeneous equilibria is derived. It provides a fine description of some nonlinear and multidimensional phenomena such as the existence of Best frequencies. Numerical results for the 1Dx1D and 2Dx2D Vlasov-Poisson system illustrate the effectiveness of this approach.
We consider the question of linear instability of an equilibrium of the Relativistic Vlasov-Maxwell (RVM) System that has a strong magnetic field. Standard instability results deal with systems where there are fewer particles with higher energies. In this paper we extend those results to the class of equilibria for which the number of particles does not depend monotonically on the energy. Without the standard sign assumptions, the analysis becomes significantly more involved.
Linearized Stability of Non-Isolated Equilibria of Quasilinear Parabolic Problems in Interpolation Spaces
本文研究了准线性抛物型问题在插值空间中非孤立平衡解的稳定性，通过灵活的插值方法和低正则性假设，扩展了此前结果，并应用于毛细力驱动的Hele-Shaw问题和分数平均曲率流。
We consider the 1/2-dimensional relativistic Vlasov-Maxwell system that describes the time-evolution of a plasma. We find a relatively simple criterion for spectral instability of a wide class of equilibria. This class includes non-homogeneous equilibria that need not satisfy any additional symmetry properties (as was the case in previous results), nor should they be monotone in the particle energy. The criterion is given in terms of the spectral properties of two Schrödinger operators that arise naturally from Maxwell's equations. The spectral analysis of these operators is quite delicate, an…
In this paper, we establish derivative estimates for the Vlasov-Poisson system with screening interactions around Penrose-stable equilibria on the phase space $\mathbb{R}^d_x\times \mathbb{R}_v^d$, with dimension $d\ge 3$. In particular, we establish the optimal decay estimates for higher derivatives of the density of the perturbed system, precisely like the free transport, up to a log correction in time. This extends the recent work \cite{T-R-HK} by Han-Kwan, Nguyen and Rousset to higher derivatives of the density. The proof makes use of several key observations from \cite{T-R-HK} on the stru…
We consider the Vlasov-HMF (Hamiltonian Mean-Field) model. We consider solutions starting in a small Sobolev neighborhood of a spatially homogeneous state satisfying a linearized stability criterion (Penrose criterion). We prove that these solutions exhibit a scattering behavior to a modified state, which implies a nonlinear Landau damping effect with polynomial rate of damping.
We consider linear stability of steady states of 1(1/2) and 3D Vlasov-Maxwell systems for collisionless plasmas. The linearized systems can be written as separable Hamiltonian systems with constraints. By using a general theory for separable Hamiltonian systems, we recover the sharp linear stability criteria obtained previously by different approaches. Moreover, we obtain the exponential trichotomy estimates for the linearized Vlasov-Maxwell systems in both relativistic and nonrelativistic cases.
We study the linearized Vlasov equations and the linearized Vlasov-Fokker-Planck equations in the weakly collisional limit in a uniform magnetic field. In both cases, we consider periodic confinement and Maxwellian (or close to Maxwellian) backgrounds. In the collisionless case, for modes transverse to the magnetic field, we provide a precise decomposition into a countably infinite family of standing waves for each spatial mode. These are known as Bernstein modes in the physics literature, though the decomposition is not an obvious consequence of any existing arguments that we are aware of. We…
Spectrum of the linearized Vlasov--Poisson equation around steady states from galactic dynamics
该研究针对星系动力学中能量递减连续稳态附近的引力线性化Vlasov-Poisson方程，确定了绝对连续谱，给出振荡模存在判据与数量估计，且方法可纳入吸引外势。
We consider the plasma confined in a general axisymmetric spatial domain with perfect conducting boundary which reflects particles specularly, and look at a certain class of equilibria, assuming axisymmetry in the problem. We prove a sharp criterion of spectral stability under these settings. Moreover, we provide several explicit families of stable/unstable equilibria using this criterion.
Continuous Family of Equilibria of the 3D Axisymmetric Relativistic Vlasov-Maxwell System
本文在轴对称有界域上构造相对论性Vlasov-Maxwell系统的连续参数化平衡族，解具有任意大电磁场，并发现谱稳定性随参数变化。
A one-dimensional, collisionless plasma given by the Vlasov-Poisson system is considered and the stability properties of periodic steady state solutions known as Bernstein-Greene-Kruskal (BGK) waves are investigated. Sufficient conditions are determined under which BGK waves are linearly unstable under perturbations that share the same period as the equilibria. It is also shown that such solutions cannot support a monotonically decreasing particle distribution function.
In this paper we study the linearized Vlasov-Poisson equation for localized disturbances of an infinite, homogeneous Maxwellian background distribution in $\mathbb R^3_x \times \mathbb R^3_v$. In contrast with the confined case $\mathbb T^d _x \times \mathbb R_v ^d$, or the unconfined case $\mathbb R^d_x \times \mathbb R^d_v$ with screening, the dynamics of the disturbance are not scattering towards free transport as $t \to \pm \infty$: we show that the electric field decomposes into a very weakly-damped Klein-Gordon-type evolution for long waves and a Landau-damped evolution. The Klein-Gordon…
By identifying a norm capturing the effect of the forcing governed by the Poisson equation, we give a detailed spectrum analysis on the linearized Vlasov-Poisson-Boltzmann system around a global Maxwellian. It is shown that the electric field governed by the self-consistent Poisson equation plays a key role in the analysis so that the spectrum structure is genuinely different from the well-known one of the Boltzmann equation. Based on this, we give the optimal time decay rates of solutions to the equilibrium.
We give a proof for the asymptotic exponential stability of equilibria of quasilinear parabolic evolution equations in admissible interpolation spaces.
We prove that the Debye screening length emerges in a spatially homogeneous plasma described by the nonlinear Vlasov-Poisson equation interacting with a point charge. While screened stationary states as well as the time-dependent problem are well-studied for the linearized equation, there are few rigorous results on screening in the nonlinear setting. As such, the results presented here cover the stationary case under the assumptions predicted by the linearized theory.
We study the dynamics of perturbations around an inhomogeneous stationary state of the Vlasov-HMF (Hamiltonian Mean-Field) model, satisfying a linearized stability criterion (Penrose criterion). We consider solutions of the linearized equation around the steady state, and prove the algebraic decay in time of the Fourier modes of their density. We prove moreover that these solutions exhibit a scattering behavior to a modified state, implying a linear Landau damping effect with an algebraic rate of damping.
Stability and Instability of Equilibria in Age-Structured Diffusive Populations
本文为年龄结构扩散种群模型建立线性化稳定性判据，证明平衡态稳定性由线性化特征值实部决定，并利用半群最终紧性完成证明，辅以实例验证。
The Vlasov-Poisson-Boltzmann System governs the time evolution of the distribution function for the dilute charged particles in the presence of a self-consistent electric potential force through the Poisson equation. In this paper, we are concerned with the rate of convergence of solutions to equilibrium for this system over ${\mathbb{R}}^3$. It is shown that the electric field which is indeed responsible for the lowest-order part in the energy space reduces the speed of convergence and hence the dispersion of this system over the full space is slower than that of the Boltzmann equation withou…
In the present paper, we consider the initial value problem for the bipolar Vlasov-Poisson-Boltzmann (bVPB) system and its corresponding modified Vlasov-Poisson-Boltzmann (mVPB). We give the spectrum analysis on the linearized bVPB and mVPB systems around their equilibrium state and show the optimal convergence rate of global solutions. It was showed that the electric field decays exponentially and the distribution function tends to the absolute Maxwellian at the optimal convergence rate $(1+t)^{-3/4}$ for the bVPB system, yet both the electric field and the distribution function converge to e…
A global solvability result of the Cauchy problem of the two-species Vlasov-Maxwell-Landau system near a given global Maxwellian is established by employing an approach different than that of [5]. Compared with that of [5], the minimal regularity index and the smallness assumptions we imposed on the initial data are weaker. Our analysis does not rely on the decay of the corresponding linearized system and the Duhamel principle and thus it can be used to treat the one-species Vlasov-Maxwell-Landau system for the case of $γ>-3$ and the one-species Vlasov-Maxwell-Boltzmann system for the case of …
We analyse a reduced 1D Vlasov--Maxwell system introduced recently in the physical literature for studying laser-plasma interaction. This system can be seen as a standard Vlasov equation in which the field is split in two terms: an electrostatic field obtained from Poisson's equation and a vector potential term satisfying a nonlinear wave equation. Both nonlinearities in the Poisson and wave equations are due to the coupling with the Vlasov equation through the charge density. We show global existence of weak solutions in the non-relativistic case, and global existence of characteristic soluti…
In this paper we prove the existence of a large class of periodic solutions of the Vlasov-Poisson in one space dimension that decay exponentially as t goes to infinity. The exponential decay is well known for the linearized version of the Landau damping problem and it has been proved in [4] for a class of solutions of the Vlasov-Poisson system that behaves asymptotically as free streaming solutions and are sufficiently flat in the space of velocities. The results in this paper enlarge the class of possible asymptotic limits, replacing the fatness condition in [4] by a stability condition for t…
Memory Stabilizes Spontaneous Particle Aggregation: A Linearized Vlasov--Fokker--Planck Analysis
该研究通过线性化Vlasov-Fokker-Planck分析，证明记忆可稳定自发粒子聚集的不稳定模式，且不会破坏无记忆时的稳定均匀态，还推导了相关定态解分支。
Global classical solutions to the ionic Vlasov-Poisson-Boltzmann system in a 3D periodic box
本文研究了三维周期箱中离子Vlasov-泊松-玻尔兹曼系统的全局经典解问题，通过非线性能量方法和新coercivity不等式，证明了在小初始扰动下存在唯一具有指数衰减的全局解。
Nonlinear Landau damping for the two-species screened Vlasov-Poisson system with large initial distributions
研究两物种屏敝泊松系统在大初始分布下的非线性兰道阻尼，证明全局强解的存在唯一性及Penrose稳定平衡态的时间渐进行为，确定净电荷密度的最优衰减率t^{-d}。
Well-posedness and trend to equilibrium for the Vlasov-Poisson-Fokker-Planck system with a confining potential
该研究针对带外部约束势的Vlasov-Poisson-Fokker-Planck系统，借助Lyapunov泛函、线性化系统新估计及不动点方法，证明了加权Sobolev空间中mild解的存在唯一性，以及解向全局平衡态的指数收敛性，且收敛速率估计显式可构造。
A new proof of nonlinear Landau damping for the 3D Vlasov-Poisson system near Poisson equilibrium
本文针对三维弗拉索夫-泊松系统近泊松平衡态的非线性朗道阻尼问题，基于已有基础工作，通过精确衰减估计与新颖分解技术提供简化证明，揭示扰动密度的类自由输运行为，增进对无约束环境中朗道阻尼的理解。
The non-cutoff Vlasov-Poisson-Boltzmann system with weak collisions
本文研究弱碰撞非截断 Vlasov-Poisson-Boltzmann 系统，提出速度加权能量与向量场方法，证明 Maxwell 分布附近光滑解全局存在，并获得增强耗散及密度和电场的 Landau 阻尼。
On the asymptotic behavior of the NNLIF neuron model for general connectivity strength
本文研究 NNLIF 神经元模型的渐近行为，提出不受连接参数限制的平衡点线性化稳定性判据，并结合谱分析完善弱连接下的非线性稳定性结果。
The hydrodynamic evolution of self-gravitating gaseous stars is governed by the Euler-Poisson equations. We study the structure of the linear approximation of barotropic perturbations around spherically symmetric equilibria based on functional analytic tools. In contrast to folklore, we show that the spectrum of the linearized operator for general perturbations is not of the Sturm-Liouville type unless the perturbations are restricted. In particular, we prove that it is of the Sturm-Liouville type for irrotational perturbations.
Convergence to stationary solutions in fully nonlinear parabolic systems with general nonlinear boundary conditions is shown in situations where the set of stationary solutions creates a $C^2$-manifold of finite dimension which is normally stable. We apply the parabolic Hölder setting which allows to deal with nonlocal terms including highest order point evaluation. In this direction some theorems concerning the linearized systems is also extended. As an application of our main result we prove that the lens-shaped networks generated by circular arcs are stable under the surface diffusion flow.
Galaxy dynamics, gravitational Vlasov-Poisson system, Landau damping, and scattering theory
研究围绕多方球和金稳态线性化的引力弗拉索夫 - 泊松系统，通过发展平稳散射理论等方法，精确描述星系或星系团中恒星或星系的长时间动力学，证明相关初始状态下引力朗道阻尼成立。
Multiphasic formulation of Vlasov equations and applications
本文研究Vlasov方程的多相公式，将其化为耦合无压力Euler系统，在低正则性下建立局部适定性统一理论，并应用于Vlasov-Poisson与Vlasov-Navier-Stokes系统，证明极限与稳定性结果。
We reformulate a general class of classical bead-spring-chain models for dilute polymeric fluids, with Hookean spring potentials, as McKean-Vlasov diffusion. This results in a coupled system of partial differential equations involving the unsteady incompressible linearized Navier-Stokes equations, referred to as the Oseen system, for the velocity and the pressure of the fluid, with a source term which is a nonlinear function of the probability density function, and a second-order degenerate parabolic Fokker-Planck equation, whose transport terms depend on the velocity field, for the probabilit…
Modified scattering of small data solutions to the Vlasov-Poisson system with a trapping potential
本文研究带捕获势的二维 Vlasov-Poisson 系统小数据解，利用 Hamiltonian 流的一致双曲性证明全局存在性，并建立修正散射理论，刻画分布函数与空间密度的晚期渐近行为。
We analyze a class of nonlinear partial differential equations (PDEs) defined on $\mathbb{R}^d \times \mathcal{P}_2(\mathbb{R}^d),$ where $\mathcal{P}_2(\mathbb{R}^d)$ is the Wasserstein space of probability measures on $\mathbb{R}^d$ with a finite second-order moment. We show that such equations admit a classical solutions for sufficiently small time intervals. Under additional constraints, we prove that their solution can be extended to arbitrary large intervals. These nonlinear PDEs arise in the recent developments in the theory of large population stochastic control. More precisely they ar…
Scattering problem for Vlasov-type equations on the $d$-dimensional torus with Gevrey data
该研究针对d维环面上描述单种等离子体演化的Vlasov型方程，在Gevrey正则性的小扰动渐近态下求解终值问题，将已有解析正则性散射结果推广到Gevrey微扰情形与高维，解决了相关公开问题。
We consider solutions of the repulsive Vlasov-Poisson system which are a combination of a point charge and a small gas, i.e.\ measures of the form $δ_{(\mathcal{X}(t),\mathcal{V}(t))}+μ^2d{\bf x}d{\bf v}$ for some $(\mathcal{X}, \mathcal{V}):\mathbb{R}\to\mathbb{R}^6$ and a small gas distribution $μ:\mathbb{R}\to L^2_{{\bf x},{\bf v}}$, and study asymptotic dynamics in the associated initial value problem. If initially suitable moments on $μ_0=μ(t=0)$ are small, we obtain a global solution of the above form, and the electric field generated by the gas distribution $μ$ decays at an almost optim…
Derivation of 2D Vlasov-Poisson for classical particles with Coulomb interactions
该研究首次无微观截断推导含库仑相互作用经典粒子的二维弗拉索夫-泊松方程，采用双层次方法结合双BBGKY层次分析，结果可推广至奇异相互作用、布朗粒子，时间上全局成立。
In this paper, we study Landau damping in the weakly collisional limit of a Vlasov-Fokker-Planck equation with nonlinear collisions in the phase-space $(x,v) \in \mathbb T_x^n \times \mathbb R^n_v$. The goal is four-fold: (A) to understand how collisions suppress plasma echoes and enable Landau damping in agreement with linearized theory in Sobolev spaces, (B) to understand how phase mixing accelerates collisional relaxation, (C) to understand better how the plasma returns to global equilibrium during Landau damping, and (D) to rule out that collision-driven nonlinear instabilities dominate. W…
Small data solutions for the Vlasov-Poisson system with a trapping potential
该研究针对带不稳定捕获势的 Vlasov–Poisson 系统，利用稳定/不稳定分布中的交换向量场及二维修正向量场技术，证明小初值解的尖锐时空衰减估计并显式构造捕获集。
Linear Landau damping for the Vlasov-Maxwell system in $\mathbb{R}^3$
本文研究了整体空间中线性化相对论 Vlasov-Maxwell 系统，在径向光滑快速衰减平衡态假设下，证明了电磁场的代数色散衰减，并刻画了电标量势与磁矢势由不同色散波包驱动的主导行为。
Nonlinear Landau damping for the Vlasov-Poisson system in $\R^3$: the Poisson equilibrium
研究欧氏空间中弗拉索夫-泊松系统的泊松齐次平衡渐近稳定性，证明其小光滑局域扰动存在全局解且以多项式速率散射到线性解，阐明了该欧氏问题与周期情形朗道阻尼的关键差异。
Remarks on Landau damping
该研究针对经典Vlasov-Poisson系统的非线性朗道阻尼给出多维度注记，涵盖面向非专业者的解析性框架等内容，还在一类全新的Vlasov-Riesz系统中建立了非线性朗道阻尼，且该类系统包含锐解析空间中的临界Vlasov-Dirac-Benney系统。
State-law dynamics of McKean-Vlasov stochastic reaction-diffusion equations on $\mathbb R^n$: pullback random attractors and zero-noise stability
针对R^n上一类McKean-Vlasov随机反应扩散方程，构造乘积空间上的连续随机动力系统，得到其唯一拉回随机吸引子，证明零噪声上半连续性及收缩机制下的定量收敛性。
The Landau-Lifshitz equation describes the behaviour of magnetization inside a ferromagnetic object. It is known that the Landau-Lifshitz equation has an infinite number of stable equilibrium points. The existence of multiple stable equilibria is closely related to hysteresis. This is a phenomenon that is often characterized by a looping behaviour; however, the existence of a loop is not sufficient to identify hysteretic systems, but is defined more precisely as the presence of looping as the frequency of the input goes to zero. We describe these two approaches to identification of hysteresis …
Consider the Vlasov-Poisson-Landau system with Coulomb potential in the weakly collisional regime on a $3$-torus, i.e. $$\begin{aligned} \partial_t F(t,x,v) + v_i \partial_{x_i} F(t,x,v) + E_i(t,x) \partial_{v_i} F(t,x,v) = νQ(F,F)(t,x,v),\\ E(t,x) = \nabla Δ^{-1} (\int_{\mathbb R^3} F(t,x,v)\, \mathrm{d} v - \frac{1}{(2π)^3}\int_{\mathbb T^3} \int_{\mathbb R^3} F(t,x,v)\, \mathrm{d} v \, \mathrm{d} x), \end{aligned}$$ with $ν\ll 1$. We prove that for $ε>0$ sufficiently small (but independent of $ν$), initial data which are $O(εν^{1/3})$-Sobolev space perturbations from the global Maxwellians …
Singular mean-field limits for fluctuations around equilibrium
研究惯性粒子系统在吉布斯平衡附近奇异相互作用的平均场极限，证明小波动渐近由线性化Vlasov方程控制，适用于包括d≤3维库仑势在内的奇异核。
First order equation on random measures as superposition of weak solutions to the McKean-Vlasov equation
本文定义了关联非局部漂移与扩散项的随机测度演化方程，证明其解可提升为McKean-Vlasov方程弱解的叠加，并利用该结果传递方程的存在唯一性，引入相关积分度量作为工具。
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