Daoyuan Fang, Sijia Zhong
In this paper, we'll prove a L^2-concentration result of Zakharov system in space dimension two, with radial initial data (u_0,n_0,n_1)\in H^s\times L^2\times H^{-1} ({16/17}<s<1), when blow up of the solution happens by I-method. In additional to that we find a blow up character of this system. Furthermore, we improve the global existence result of Bourgain's to above spaces.
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We consider the focusing modified Zakharov-Kuznetsov (mZK) equation in two space dimensions. We prove that solutions which blow up in finite time in the $H^1(\R^{2})$ norm have the property that they concentrate a non-trivial portion of their mass (more precisely, at least the amount equal to the mass of the ground state) at blow-up time. For finite-time blow-up solutions in the $H^s(\R^2)$ norm for $\frac{17}{18} < s < 1$, we prove a slightly weaker result. Moreover, we prove that the stronger concentration result can be extended to the range $ \frac{17}{18} < s \le 1$ under an additional ass…
The Cauchy problem for the Zakharov-Kuznetsov equation is shown to be locally well-posed in H^s(R^2) for all s>1/2 by using the Fourier restriction norm method and bilinear refinements of Strichartz type inequalities.
The Cauchy problem for the classical Zakharov system is shown to be ill-posed in the sense of norm inflation in a range of Sobolev spaces $H^s(\mathbb{R}^d)\times H^l(\mathbb{R}^d)$ for all dimensions $d$. This proves several results on well-posedness, which includes existence of solutions, uniqueness and continuous dependence on the initial data, to be sharp up to endpoints.
We consider the Zakharov system in the energy critical dimension $d=4$ with energy below the ground state. It is known that below the ground state solutions exist globally in time, and scatter in the radial case. Scattering below the ground state in the non-radial case is an open question. We show that if scattering fails, then there exists a minimal energy non-scattering solution below the ground state. Moreover the orbit of this solution is precompact modulo translations. The proof follows by a concentration compactness argument, together with a refined small data theory for energy dispersed…
It is shown that the spatial Sobolev norms of regular global solutions of the (2+1),(3+1) and (4+1)-dimensional Klein-Gordon-Schroedinger system and the (2+1) and (3+1)-dimensional Zakharov system grow at most polynomially with the bound depending on the regularity class of the data. The proof uses the Fourier restriction norm method.
On the stabilization of $L^2$ and $H^1$ norms for the Zakharov-Kuznetsov equation with damping
本文研究了阻尼Zakharov-Kuznetsov方程在二维和三维空间中解的L²和H¹范数指数衰减问题，采用Kato型平滑效应、唯一延续性和可观察性不等式等方法进行证明。
An initial-boundary value problem for the 2D Zakharov-Kuznetsov-Burgers equation posed on a channel-type strip was considered. The existence and uniqueness results for regular and weak solutions in weighted spaces as well as exponential decay of small solutions without restrictions on the width of a strip were proven both for regular solutions in an elevated norm and for weak solutions in the $L^2$-norm.
We consider the Zakharov-Kuznetsov equation (ZK) in space dimension 2. Solutions u with initial data u\_0 $\in$ H s are known to be global if s $\ge$ 1. We prove that for any integer s $\ge$ 2, u(t) H s grows at most polynomially in t for large times t. This result is related to wave turbulence and how a solution of (ZK) can move energy to high frequencies. It is inspired by analoguous results by Staffilani on the non linear Schr{ö}dinger Korteweg-de-Vries equation. The main ingredients are adequate bilinear estimates in the context of Bourgain's spaces.
We prove small energy scattering for the 3D Klein-Gordon-Zakharov system with radial symmetry. The idea of proof is the same as the Zakharov system studied in \cite{GN}, namely to combine the normal form reduction and the radial-improved Strichartz estimates
Low-regularity global well-posedness theory for the generalized Zakharov-Kuznetsov equation on $\mathbb{R} \times \mathbb{T}$ and polynomial growth of higher Sobolev norms
本文利用I方法和Strichartz型估计，研究了广义Zakharov-Kuznetsov方程在不同空间上的全局适定性，并证明了其高Sobolev范数的多项式增长特性。
We prove small energy scattering for the 3D Zakharov system with radial symmetry. The main ingredients are normal form reduction and the radial-improved Strichartz estimates.
The initial value problem of the Zakharov system on two dimensional torus with general period is shown to be locally well-posed in the Sobolev spaces of optimal regularity, including the energy space. Proof relies on a standard iteration argument using the Bourgain norms. The same strategy is also applicable to three and higher dimensional cases.
The Zakharov system in dimension $d=2,3$ is shown to have a local unique solution for any initial values in the energy space $H^{s} \times H^{l} \times H^{l-1}$, where the range of regularity $(s, l)$ is extended, especially at $s=l-1$. The result is obtained mainly by the normal form reduction and the Strichartz estimates.
Spatial regularity properties of certain global-in-time solutions of the Zakharov system are established. In particular, the evolving solution $u(t)$ is shown to satisfy an estimate $\Hsup s {u(t)} \leq C {{|t|}^{(s-1)+}}$, where $H^s$ is the standard spatial Sobolev norm. The proof is an adaptation of earlier work on the nonlinear Schrödinger equation which reduces matters to bilinear estimates.
We study here the Zakharov-Kuznetsov equation in dimension $2$ and $3$ and the modified Zakharov-Kuznetsov equation in dimension $2$. Those equations admit solitons, characterized by their velocity and their shift. Given the parameters of $K$ solitons $R^k$ (with distinct velocities), we prove the existence and uniqueness of a multi-soliton $u$ such that $\left\| u- \sum_{k=1}^K R^k \right\|_{H^1}\rightarrow 0 $ as $t \rightarrow +\infty$. The convergence takes place in $H^s$ with an exponential rate for all $s\geq 0$. The construction is made by successive approximations of the multi-soliton.…
Small energy scattering for radial solutions to the generalized Zakharov system
本文基于Guo-Nakanishi思想，利用频率局部化正规形约化和径向改进的Strichartz估计，证明了三维广义Zakharov系统径向解的小能量散射，并处理了积分方程与微分方程的关系。
Upper bound of higher-order Sobolev norms for Zkaharov system in one space dimension
本文研究一维Zkaharov系统在Diriclet边界条件下的Cauchy问题，利用修正能量方法证明了解的整体适定性及高阶Sobolev范数的增长。
The two-dimensional Zakharov system is shown to have a unique global solution for data without finite energy if the L^2 - norm of the Schrödinger part is small enough. The proof uses a refined I-method originally initiated by Colliander, Keel, Staffilani, Takaoka and Tao. A polynomial growth bound for the solution is also given.
We study decay properties for solutions to the initial value problem associated with the one-dimensional Zakharov-Rubenchik/Benney-Roskes system. We prove time-integrability in growing compact intervals of size $t^{r}$, $r<2/3$, centered on some characteristic curves coming from the underlying transport equations associated with the ZR/BR system. Additionally, we prove decay to zero of the local energy-norm in so-called far-field regions. Our results are independent of the size of the initial data and do not require any parity condition.
Global existence for a Zakharov type system in a domain
研究三维一般区域中Zakharov型系统的初边值问题，在初始数据小假设下，通过高阶能量估计和Cauchy序列构造，直接得到唯一全局强解，并给出高阶Sobolev范数增长估计。
Low regularity analysis of the Zakharov--Kuznetsov equation on $\mathbb{R} \times \mathbb{T}$
本文研究柱面上 Zakharov-Kuznetsov 方程的 Cauchy 问题，通过改进共振集的几何分析将局部适定性提升至 $s>1/2$ 且证明其最优性，并利用低正则性修正的 $X^{s,b}$ 空间在随机初始数据下获得 $s<0$ 的一般数据解。
We consider the final-state problem for the Zakharov system in the energy space in three space dimensions. For $(u_+, v_+) \in H^1 \times L^2$ without any size restriction, symmetry assumption or additional angular regularity, we perform a physical-space randomization on $u_+$ and an angular randomization on $v_+$ yielding random final states $(u_+^ω, v_+^ω)$. We obtain that for almost every $ω$, there is a unique solution of the Zakharov system scattering to the final state $(u_+^ω, v_+^ω)$. The key ingredient in the proof is the use of time-weighted norms and generalized Strichartz estimates…
Global well-posedness for the Cauchy problem of the Zakharov-Kuznetsov equation on cylindrical spaces
本文证明了柱空间上 Zakharov-Kuznetsov 方程在能量范数以下的整体适定性，通过采用 I-method 延拓解并利用修正能量得到 $H^s$ 增长的多项式界。
We prove low-regularity global well-posedness for the 1d Zakharov system and 3d Klein-Gordon-Schrödinger system, which are systems in two variables $u:\mathbb{R}_x^d\times \mathbb{R}_t \to \mathbb{C}$ and $n:\mathbb{R}^d_x\times \mathbb{R}_t\to \mathbb{R}$. The Zakharov system is known to be locally well-posed in $(u,n)\in L^2\times H^{-1/2}$ and the Klein-Gordon-Schrödinger system is known to be locally well-posed in $(u,n)\in L^2\times L^2$. Here, we show that the Zakharov and Klein-Gordon-Schrödinger systems are globally well-posed in these spaces, respectively, by using an available conser…
In this paper we consider the Zakharov system with periodic boundary conditions in dimension one. In the first part of the paper, it is shown that for fixed initial data in a Sobolev space, the difference of the nonlinear and the linear evolution is in a smoother space for all times the solution exists. The smoothing index depends on a parameter distinguishing the resonant and nonresonant cases. As a corollary, we obtain polynomial-in-time bounds for the Sobolev norms with regularity above the energy level. In the second part of the paper, we consider the forced and damped Zakharov system and …
We consider here the local existence of strong solutions for the Zakharov-Kuznestov (ZK) equation posed in a limited domain (0,1)_{x}\times(-pi /2, pi /2)^d, d=1,2. We prove that in space dimensions 2 and 3, there exists a strong solution on a short time interval, whose length only depends on the given data. We use the parabolic regularization of the ZK equation to derive the global and local bounds independent of epsilon for various norms of the solution. In particular, we derive the local bound of the nonlinear term by a singular perturbation argument. Then we can pass to the limit and hence…
The present paper is devoted to the study of the well-posedness and the lower bound of blow-up rate to the Cauchy problem of the generalized Zakharov(GZ) equations with magnetic field in R^d. The work of well-posedness of the GZ system bases on the local well-posedness theory in [9]. At first, the existence, uniqueness and continuity of solution to the GZ system with magnetic field in Rd is proved. Next, we establish the lower bound of blow-up rate of blow-up solution in sobolev spaces to the GZ system, which is almost a critical index. Finally, we obtain the long time behavior of global solut…
Multilinear Weighted Estimates and Quantum Zakharov System
本文研究了一维量子Zakharov系统的多线性加权估计，通过Bourgain范数方法证明了低正则性局部适定性，并在无小性假设下证明了全局适定性，同时探讨了量子极限在不同时间区间的行为。
Local and global well-posedness for the 2D Zakharov-Kuznetsov-Burgers equation in low regularity Sobolev space
该研究针对带耗散项的二维ZKB方程柯西问题，采用结合耗散效应的Fourier限制范数方法，将其适定性的Sobolev空间指标下限拓展至$s>-1/2$，改进了已有相关方程的适定性结果。
We show that the initial value problem associated to the dispersive generalized Benjamin-Ono-Zakharov-Kuznetsov equation$$ u\_t-D\_x^αu\_{x} + u\_{xyy} = uu\_x,\quad (t,x,y)\in\R^3,\quad 1\le α\le 2,$$is locally well-posed in the spaces $E^s$, $s\textgreater{}\frac 2α-\frac 34$, endowed with the norm$\|f\|\_{E^s} = \|\langle |ξ|^α+μ^2\rangle^s\hat{f}\|\_{L^2(\R^2)}.$As a consequence, we get the global well-posedness in the energy space $E^{1/2}$ as soon as $α\textgreater{}\frac 85$. The proof is based on the approach of the short time Bourgain spaces developed by Ionescu, Kenig and Tataru \cit…
We consider the scalar Zakharov system in $\R^3$ for initial conditions $(ψ(0), n(0), n_t(0)) \in H^{\ell+1/2} \times H^\ell \times H^{\ell-1} $, $0\leq\ell \leq 1$. Assuming that the solution blows up in a finite time $t^* < \infty$, we establish a lower bound for the rate of blow-up of the corresponding Sobolev norms in the form $$ \|ψ(t)\|_{H^{\ell+1/2}} +\|n(t)\|_{H^{\ell}} + \|n_t(t)\|_{H^{\ell-1}} > C(t^*-t)^{-θ_\ell} $$ with $θ_\ell = \frac{1}{4}(1+ 2 \ell)^-$. The analysis is a reappraisal of the local wellposedness theory of Ginibre, Tsutsumi and Velo (1997) combined with an argument …
Global dynamics above the ground state energy for the 3D Zakharov system
该研究对能量略高于基态能量的三维Zakharov系统径向初值，通过正则形式技术和新型局域virial估计，将初值划分为9个区域并分类解的全局动力学，拓展了此前基态能量以下的相关结果。
We prove local in time well-posedness for the Zakharov system in two space dimensions with large initial data in L^2 x H^{-1/2} x H^{-3/2}. This is the space of optimal regularity in the sense that the data-to-solution map fails to be smooth at the origin for any rougher pair of spaces in the L^2-based Sobolev scale. Moreover, it is a natural space for the Cauchy problem in view of the subsonic limit equation, namely the focusing cubic nonlinear Schroedinger equation. The existence time we obtain depends only upon the corresponding norms of the initial data - a result which is false for the cu…
On the minimal Blow-up rate for the 2D generalized Zakharov- Kuznetsov model
研究二维广义Zakharov-Kuznetsov方程在H^s空间中的破裂率下界，结合线性估计和局部well-posedness理论，发现修改方程的破裂率存在理论间隙。
Scattering of the 3D Zakharov-Kuznetsov equation
本文研究三维Zakharov-Kuznetsov方程的全局解散射性质，采用时空共振方法和部分对称性方法，引入各向异性加权范数，证明散射估计和先验估计。
Invariant Gibbs dynamics for the two-dimensional Zakharov-Yukawa system
本文研究二维环面上Zakharov-Yukawa系统的Gibbs动力学，在弱非线性耦合下构造Gibbs测度揭示相变，并基于一阶展开与算子范数方法证明系统的几乎必然整体适定性与测度不变性。
The energy-critical stochastic Zakharov system
本文研究四维能量临界随机Zakharov系统，证明了能量空间中的局部适定性与爆破二择一、大初值下低于基态阈值的全局存在性，以及非守恒噪声强度趋于无穷时全局存在且散射的概率趋于1的噪声正则化现象。
The three dimensional stochastic Zakharov system
本文研究三维随机扎卡罗夫系统在能量空间中的well-posed性，证明了系统在最大存在时间内的解的存在性和爆炸替代，利用精细的缩放变换和正常形式方法，并结合局部平滑估计控制噪声引起的低阶扰动，最终证明了通过添加足够大的非保守噪声可防止有限时间爆炸。
Optimal Decay Estimate and Asymptotic Profile for Solutions to the Generalized Zakharov-Kuznetsov-Burgers Equation in 2D
本文研究二维广义Zakharov-Kuznetsov-Burgers方程柯西问题，证明解的L^∞最优衰减速率为t^(-3/4)，并结合抛物与薛定谔方程技巧推导出显式渐近轮廓。
We consider the inhomogeneous nonlinear Schrödiger equation (INLS) in $\mathbb{R}^N$ $$i \partial u_t + Δu + |x|^{-b} |u|^{2σ}u = 0,$$ and show the $L^2$-norm concentration for the finite time blow-up solutions in the $L^2$-critical case, $σ=\frac{2-b}{N}$. Moreover, we provide an alternative for the classification of minimal mass blow-up solutions first proved by Genoud and Combet [4]. For the case $\frac{2-b}{N} < σ< \frac{2-b}{N-2}$, we show results regarding the $L^p$-critical norm concentration, generalizing the argument of Holmer and Roudenko [16] to the INLS setting.
Partial regularity and $L^3$-norm concentration effects around possible blow-up points for the micropolar fluid equations
本文研究微极流体方程，在速度场附加条件下证明弱解的光滑性，并给出速度场$L^3_x$范数在可能奇异时间附近的集中效应。
We consider the inhomogeneous biharmonic nonlinear Schrödinger (IBNLS) equation in $\mathbb{R}^N$, $$i \partial_t u +Δ^2 u -|x|^{-b} |u|^{2σ}u = 0,$$ where $σ>0$ and $b>0$. We first study the local well-posedness in $\dot H^{s_c}\cap \dot H^2 $, for $N\geq 5$ and $0<s_c<2$, where $s_c=\frac{N}{2}-\frac{4-b}{2σ}$. Next, we established a Gagliardo-Nirenberg type inequality in order to obtain sufficient conditions for global existence of solutions in $\dot H^{s_c}\cap \dot H^2$ with $0\leq s_c<2$. Finally, we study the phenomenon of $L^{σ_c}$-norm concentration for finite time blow up solutions w…
This paper is concerned with two dual aspects of the regularity question of the Navier-Stokes equations. First, we prove a local in time localized smoothing effect for local energy solutions. More precisely, if the initial data restricted to the unit ball belongs to the scale-critical space $L^3$, then the solution is locally smooth in space for some short time, which is quantified. This builds upon the work of Jia and Šverák, who considered the subcritical case. Second, we apply these localized smoothing estimates to prove a concentration phenomenon near a possible Type I blow-up. Namely, we …
Nonlinear Stability of nonsingular solitons of the Principal Chiral Field equation
本研究证明了主陈型场方程中非奇异孤立子的非线性稳定性，采用向量场方法扩展了扰动的null加权范数时间范围。
We observe a link between the window size of mass concentration and the rate of explosion of the Strichartz norm by revisiting Bourgain's mass concentration for the L^2-critical nonlinear Schrodinger equations.
We consider in this article the system of gravity-capillary waves in all dimensions and under the Zakharov/Craig-Sulem formulation. Using a paradifferential approach introduced by Alazard-Burq-Zuily, we symmetrize this system into a quasilinear dispersive equation whose principal part is of order $3/2$. The main novelty, compared to earlier studies, is that this reduction is performed at the Sobolev regularity of quasilinear pdes: $H^s(R^d)$ with $s\textgreater{}3/2+d/2$, $d$ being the dimension of the free surface. From this reduction, we deduce a blow-up criterion involving solely the Lipsch…
A multi-scale characterization of the field concentrations inside composite and polycrystalline media is developed. The analysis focuses on gradient fields associated with the intensive quantities given by the temperature and the electric potential. In the linear regime these quantities are modeled by the solution of a second order elliptic partial differential equation with oscillatory coefficients. Field concentrations are measured using the $L^p$ norm of the gradient of the solution for p>2. The analysis focuses on the case when the length scale of the heterogeneities are small relative to …
We exclude Type I blow-up, which occurs in the form of atomic concentrations of the $L^2$ norm for the solution of the 3D incompressible Euler equations. As a corollary we prove nonexistence of discretely self-similar blow-up in the energy conserving scale.
- In this article, we prove some universal bounds on the speed of concentration on small (frequency-dependent) neighborhoods of submanifolds of L 2-norms of quasi modes for Laplace operators on compact manifolds. We deduce new results on the rate of decay of weakly damped wave equations. R{é}sum{é}.
We consider singularities of the focusing subconformal nonlinear wave equation and some generalizations of it. At noncharacteristic points on the singularity surface, Merle and Zaag have identified the rate of blow-up of the $H^1$-norm of the solution inside cones that terminate at the singularity. We derive bounds that restrict how this $H^1$-energy can be distributed inside such cones. Our proof relies on new localized estimates obtained using Carleman- type inequalities for such nonlinear waves. These bound the $L^{p+1}$-norm in the interior of timelike cones by their $H^1$-norm near the bo…
We consider the drift-diffusion equation $u_t-εΔu + \nabla \cdot(u\nabla K^*u)=0$ in the whole space with global-in-time solutions bounded in all Sobolev spaces; for simplicity, we restrict ourselves to the model case $K(x)=-|x|$. We quantify the mass concentration phenomenon, a genuinely nonlinear effect, for radially symmetric solutions of this equation for small diffusivity $ε$ studied in our previous paper [3], obtaining optimal sharp upper and lower bounds for Sobolev norms.
Quasimode concentration on compact space forms
本文证明紧致空间形式上拟模态$L^2$范数上界的尖锐性，并利用对数拟模态$L^1$范数下界衰减率及周期测地线附近的集中现象刻画常截面曲率流形，解决了一个开放问题。
We survey recent results related to the concentration of eigenfunctions. We also prove some new results concerning ball-concentration, as well as showing that eigenfunctions saturating lower bounds for $L^1$-norms must also, in a measure theoretical sense, have extreme concentration near a geodesic.
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