Existence and regularity of solutions in nonlinear wave equations
Geng Chen, Yannan Shen
本文研究一类描述非线性波的非线性偏微分方程的Hölder连续解的整体存在性和正则性.
In this paper, we study the global existence and regularity of Hölder continuous solutions for a series of nonlinear partial differential equations describing nonlinear waves.
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In this paper, we prove boundary pointwise $C^{k,α}$ regularity for any $k\geq 1$ for fully nonlinear parabolic equations. As an application, we give a direct and short proof of the higher regularity of the free boundaries in obstacle-type problems.
Regularity of the solutions for nonlinear biharmonic equations in R^{N}
建立了一类非线性双调和方程弱解的正则性.
In this paper, regularity properties of Cauchy problem for linear and nonlinear abstract Schrödinger equations in vector-valued function spaces are obtained.
In this paper, we prove a boundary pointwise regularity for fully nonlinear elliptic equations on cones. In addition, based on this regularity, we give simple proofs of the Liouville theorems on cones.
On the regularity of solutions to a class of nonlinear dispersive equations
我们将研究某些非线性色散模型解的特殊正则性。我们的目标是展示如何将初始数据的规律性转移到解决方案中。这将取决于测量规则性的空间。
$C^{1,α}$ Interior Regularity for Nonlinear Nonlocal Elliptic Equations With Rough Kernels
在不假设核的正则性的情况下，证明了完全非线性一致椭圆型积分微分方程的一个$C^{1,α}$内正则性定理.然后，我们给出了一些应用的线性理论和更高的正则性的一类特殊的非线性算子。
A Visual Approach to the Regularity Theory for Fully Nonlinear Elliptic Equations
本文通过视觉方法重新审视一致椭圆方程的正则性理论，旨在提供直观理解。
In this paper we prove the Hölder regularity of bounded, uniformly continuous, viscosity solutions of some degenerate fully nonlinear equations in the Heisenberg group.
We establish an optimal C^{1,α}-regularity for viscosity solutions of degenerate/singular fully nonlinear elliptic equations by finding minimal regularity requirements on the associated operator.
Regularity for Fully Nonlinear P-Laplacian Parabolic Systems: the Degenerate Case
研究一类强耦合退化抛物方程组有界弱解的Hölder正则性.
Interior regularity for nonlocal fully nonlinear equations with Dini continuous terms
研究了具有Dini连续项的非平移不变非局部完全非线性方程黏性解的内部正则性。利用摄动方法和递归Evans-Krylov定理得到了非局部方程的$C^σ$正则性估计.
Regularity results for fully nonlinear parabolic integro-differential operators
本文考虑具有对称核的完全非线性抛物型积分微分方程的正则性理论。我们能够找到Alexandrov-Backelman-Pucci估计的抛物线版本，其中0<σ<2。通过获得解的水平集的衰减估计，我们证明了解的Harnack不等式、Hölder正则性和C^{1，α}-正则性。
We show how to infer sharp partial regularity results for relaxed minimizers of degenerate, nonuniformly elliptic quasiconvex functionals, using tools from Nonlinear Potential Theory. In particular, in the setting of functionals with $(p,q)$-growth - according to the terminology of Marcellini [52] - we derive optimal local regularity criteria under minimal assumptions on the data.
A regularity theorem for fully nonlinear maximally subelliptic PDE
本文研究完全非线性极大次椭圆 PDE 的内部正则性，分别在非各向同性、各向同性 Sobolev 空间及相关经典框架中建立精确定理。
Hölder regularity of the gradient for solutions of fully nonlinear equations with sublinear first order terms
本文建立了一类一阶项为次线性项的完全非线性方程解的正则性结果。我们证明了局部Hölder正则性的梯度在内部和边界。
We obtain up to a flat boundary regularity results in parabolic Hölder spaces for viscosity solutions of fully nonlinear parabolic equations with oblique boundary conditions.
We prove that viscosity solutions to fully nonlinear elliptic equations with degeneracy of double phase type are locally $C^{1,γ}$-regular.
Interior $C^{2,α}$ regularity for fully nonlinear uniformly elliptic equations in dimension two
本文研究了二维全非线性均匀椭圆方程粘性解的内部$C^{2,α}$正则性问题。
Regularity of viscous solutions for a degenerate nonlinear Cauchy problem
考虑一类带强迫项的非线性退化抛物型方程的Cauchy问题.利用粘性消失法得到了该方程的广义解。我们证明了这类广义解的一些正则性结果。
Existence and regularity of monotone solutions to a free boundary problem
结合高维空间中是否存在完全非平面自由边界图的问题，研究了单相自由边界图的存在性和正则性.
We study the continuity in weighted Fourier Lebesgue spaces for a class of pseudodifferential operators, whose symbol has finite Fourier Lebesgue regularity with respect to $x$ and satisfies a quasi-homogeneous decay of derivatives with respect to the $ξ$ variable. Applications to Fourier Lebesgue microlocal regularity of linear and nonlinear partial differential equations are given.
Well-posedness and scattering for nonlinear Schrödinger equations with a derivative nonlinearity at the scaling critical regularity
本文考虑一类非线性薛定谔方程的Cauchy问题，该方程具有一个只依赖于$\bar{u}$的导数非线性项.在亚临界正则标度下，A。Grünrock（2000年）。利用Hadac，Herr和Koch（2009）证明KP-Ⅱ方程在尺度临界正则性下的适定性和解的散射性的$U^{2}$空间和$V^{2}$空间，证明了方程在尺度临界正则性下的适定性和解的散射性.
Gradient regularity for fully nonlinear equations with degenerate coefficients
针对在超曲面上退化的完全非线性方程，推导了粘性解的$C^{1,α}$正则性估计。
Most of lipschitz regularity results for nonlinear strictly elliptic equations are obtained for a suitable growth power of the nonlinearity with respect to the gradient variable (subquadratic for instance). For equations with superquadratic growth power in gradient, one usually uses weak Bernstein-type arguments which require regularity and/or convex-type assumptions on the gradient nonlinearity. In this article, we obtain new Lipschitz regularity results for a large class of nonlinear strictly elliptic equations with possibly arbitrary growth power of the Hamiltonian with respect to the gradi…
We study the Cauchy problem for 3-D nonlinear elastic waves satisfying the null condition with low regularity initial data. In the radially symmetric case, we prove the global existence of a low regularity solution for every small data in $H^3\times H^2$ with a low weight.
Holder regularity for fully nonlinear nonlocal equations
本综述证明带局部梯度项的完全非线性非局部一致椭圆方程的粘性解具有Hölder正则性，推广了Barles等人2011年的结果至极值非局部算子。
Regularity for radial solutions of degenerate fully nonlinear equations
本文证明了当算子是Hessian算子、Hessian算子中的一次齐次算子、梯度算子中的某次齐次算子$α>-1$以及当梯度不为零时的椭圆算子时，完全非线性方程径向解的导数的Holder正则性.
In this paper, logarithmically improved regularity criteria for the Navier--Stokes/Poisson--Nernst--Planck system are established in terms of both the pressure and the gradient of pressure in the homogeneous Besov space.
We provide the Alexandroff-Bakelman-Pucci estimate and global $C^{1, α}$-regularity for a class of singular/degenerate fully nonlinear elliptic equations. We also derive the existence of a viscosity solution to the Dirichlet problem with the associated operator.
Regularity for anisotropic fully nonlinear integro-differential equations
我们考虑完全非线性积分微分方程的内核，在不同的方向上有不同的齐次性。我们证明了ABP估计的非局部版本，Harnack不等式和内部$C^{1, γ}$正则性，将[Caffarelli and Silvestre，CPAM 62，2009]的结果扩展到各向异性的情况。
A counterexample to $C^{2,1}$ regularity for parabolic fully nonlinear equations
我们解决了奇异抛物问题的自相似可解性，并表明抛物型完全非线性方程的解决方案预计不会是$C^{2,1}$。
Regularity theory for fully nonlinear integro-differential equations
我们考虑非线性积分微分方程，如从随机控制问题产生的纯跳Lèvy过程。我们得到了一般完全非线性积分微分方程的ABP估计、Harnack不等式和内$C^{1,α}$正则性的非局部形式。我们的估计保持一致的程度的方程接近2，所以它们可以被看作是一个自然的椭圆偏微分方程的正则性理论的延伸。
In this paper, we obtain a series of regularity results for viscosity solutions of fully nonlinear elliptic equations with oblique derivative boundary conditions. In particular, we derive the pointwise $C^α$, $C^{1,α}$ and $C^{2,α}$ regularity. As byproducts, we also prove the A-B-P maximum principle, Harnack inequality, uniqueness and solvability of the equations.
Global regularity of solutions of coupled Navier-Stokes equations and nonlinear Fokker-Planck equations
本文证明了二维空间无边界耦合Navier-斯托克斯方程和Fokker-Planck方程解的整体正则性。证明产生空间梯度的增长的先验估计。
Regularity theory for fully nonlinear oblique transmission problems
针对完全非线性斜向传输问题，建立了平坦界面下粘性解的最优正则性，得到分段C^{1,α}正则性，并推广到变系数方程。
Despite the many applications of rate-independent systems, their regularity theory is still largely unexplored. Usually, only weak solution with potentially very low regularity are considered, which requires non-smooth techniques. In this work, however, we directly prove the existence of Hölder-regular strong solutions for a class of rate-independent systems. We also establish further assertions about higher regularity of our solutions. The proof proceeds via a time-discrete Rothe approximation, careful elliptic regularity estimates in the discrete situation and evolutionary techniques.
The interior free boundary theory for linear elliptic operators in higher dimensions was developed by Caffarelli in the low regularity context. In these notes, the up-to-the boundary free boundary regularity is discussed for nonlinear elliptic operators based on a different approach.
Existence, regularity and uniqueness of weak solutions for a class of incompressible generalized Navier-Stokes system with slip boundary conditions in $\mathbb{R}^3_+$
在滑移边界条件下，得到了一类非牛顿流体为幂律流体且具有$p>9/5$的半空间非定常问题解的存在性、正则性和唯一性。
$L^p$-regularity of a geometrically nonlinear system in supercritical dimensions
本文研究了源自几何非线性平坦Cosserat微极模型的系统，在超临界维度下建立了内部正则性和精确的$L^p$正则性，扩展了Gastel和Neff在临界维度下的工作。
In this paper we establish some results concerning the existence, regularity and concentration phenomenon of nontrivial solitary waves for a Generalized Kadomtsev-Petviashvili (GKP) equation in $\mathbb{R}^2.$ Variational methods are used to get an existence result and to study the concentration phenomenon, while the regularity is more delicate because we are leading with functions in an anisotropic Sobolev space.
We investigate the regularity of the solutions for a class of degenerate/singular fully nonlinear nonlocal equations. In the degenerate scenario, we establish that there exists at least one viscosity solution of class $C_{loc}^{1, α}$, for some constant $α\in (0, 1)$. In addition, under suitable conditions on $σ$, we prove regularity estimates in Hölder spaces for any viscosity solution. We also examine the singular setting and prove Hölder regularity estimates for the gradient of the solutions.
Asymptotics and regularity of flat solutions to fully nonlinear elliptic problems
在本文中，我们建立了非凸完全非线性椭圆方程平坦解的局部$C^{2,α}$正则性估计，条件是系数和源函数都是$C^{0,α}$类。对于仅仅是连续数据的问题，我们证明了平坦解是局部的$C^{1,\text{Log-Lip}}$。
Regularity theory for nonlinear integral operators
本文证明了一类非线性积分变分问题经典解的存在性。这些问题涉及非局部图像和信号处理。
This paper deals with a class of nonlinear anisotropic parabolic equations with degenerate coercivity. Using the anisotropic Gagliardo-Nirenberg-type inequality, we prove some existence and regularity results for the solutions under the framework of anisotropic Sobolev spaces, which generalize the previous results of [10,18,23].
In this paper we study the existence of positive smooth solutions for a class of singular (p(x),q(x))- Laplacian systems by using sub and supersolution methods.
We consider nonlinear Schr{ö}dinger equations in Fourier-Lebesgue and modulation spaces involving negative regularity. The equations are posed on the whole space, and involve a smooth power nonlinearity. We prove two types of norm inflation results. We first establish norm inflation results below the expected critical regularities. We then prove norm inflation with infinite loss of regularity under less general assumptions. To do so, we recast the theory of multiphase weakly nonlinear geometric optics for nonlinear Schr{ö}dinger equations in a general abstract functional setting.
In this note, we prove $\mathcal{C}^{1,γ}$ regularity for solutions of some fully nonlinear degenerate elliptic equations with "superlinear" and "subquadratic " Hamiltonian terms. As an application, we complete the results of \cite{BDL1} concerning the associated ergodic problem, proving, among other facts, the uniqueness, up to constants, of the ergodic function.
This paper deals with existence and regularity of positive solutions of singular elliptic problems on a smooth bounded domain with Dirichlet boundary conditions involving the $Φ$-Laplacian operator. The proof of existence is based on a variant of the generalized Galerkin method that we developed inspired on ideas by Browder and a comparison principle. By using a kind of Moser iteration scheme we show $L^{\infty}(Ω)$-regularity for positive solutions
Gradient regularity for degenerate fully nonlinear free transmission problems with Hamiltonian terms
研究含哈密顿项的退化完全非线性自由传输问题，通过置于粘性不等式背景建立梯度局部赫尔德正则性，基于新估计与局部分析获逐点\(C^{1,\alpha}\)正则性。
Regularity of viscosity solutions to fully nonlinear elliptic transmission problems
该研究建立完全非线性二阶一致椭圆方程传输问题粘性解的正则性理论，完善平界面传输问题的相关基础理论，并推导曲面情形下粘性解直至传输面的多阶Hölder正则性结果。
We prove the local well-posedness for the nonlinear fourth-order Schrödinger equation (NL4S) in Sobolev spaces. We also studied the regularity of solutions in the sub-critical case. A direct consequence of this regularity is the global well-posedness above mass and energy spaces under some assumptions. Finally, we show the ill-posedness for (NL4S) in some cases of the super-critical range.
We prove existence and regularity results for weak solutions of non linear elliptic systems with non variational structure satisfying $(p,q)$-growth conditions. In particular we are able to prove higher differentiability results under a dimension-free gap between $p$ and $q$.
We are concerned with the initial value problem governed by generalized Rayleigh-Stokes equations, where the nonlinearity depends on history states and takes values in Hilbert scales of negative order. The solvability and Hölder regularity of solutions are proved by using fixed point arguments and embeddings of fractional Sobolev spaces. An application to a related inverse source problem is given.
Propagation of low regularity for solutions of nonlinear PDEs on a Riemannian manifold with a sub-Laplacian structure
继\cite{B2}之后，我们引入了与半群相关联的仿积的概念。我们不使用傅里叶变换的参数和背景流形是加倍的，赋予一个sub-Laplacian结构。我们的主要结果是在非欧几里德框架下的非线性化定理，并应用于某些非线性偏微分方程的正则性传播。
In this paper we prove regularity results for a class of nonlinear degenerate elliptic equations of the form $\displaystyle -\operatorname{div}(A(|\nabla u|)\nabla u)+B\left( |\nabla u|\right) =f(u)$; in particular, we investigate the second order regularity of the solutions. As a consequence of these results, we obtain symmetry and monotonicity properties of positive solutions for this class of degenerate problems in convex symmetric domains via a suitable adaption of the celebrated moving plane method of Alexandrov-Serrin.
In this manuscript we study geometric regularity estimates for problems driven by fully nonlinear elliptic operators under strong absorption conditions. We establish improved geometric regularity along the free boundary, for a sharp value depending only on structural parameters. Non degeneracy among others measure theoretical properties are also obtained. A sharp Liouville result for entire solutions with controlled growth at infinity is proved. We also present a number of applications consequential of our findings.
Free boundary regularity in nonlinear one-phase Stefan problem
本文针对非线性算子的一相Stefan问题，借助Hodograph变换与线性化技术证明平坦自由边界具有时空$C^{1,\alpha}$正则性，并在算子光滑且凹或凸时得到自由边界光滑性。
We consider a class of fully nonlinear integro-differential operators where the nonlocal integral has two components: the non-degenerate one corresponds to the $α$-stable operator and the second one (possibly degenerate) corresponds to a class of \textit{lower order} Lévy measures. Such operators do not have a global scaling property. We establish Hölder regularity, Harnack inequality and boundary Harnack property of solutions of these operators.
Free boundary regularity for fully nonlinear non-homogeneous two-phase problems
证明了完全非线性一致椭圆算子所支配的、右端非零的两相自由边界问题的平坦或Lipschitz自由边界是$C^{1,γ}$ .
We are concerned with the existence and regularity of the solutions to the Dirichlet problem, for a class of quasilinear elliptic equations driven by a general differential operator, depending on $(x,u,\nabla u)$, and with a convective term $f$. The assumptions on the members of the equation are formulated in terms of Young's functions, therefore we work in the Orlicz-Sobolev spaces. After establishing some auxiliary properties, that seem new in our context, we present two existence and two regularity results. We conclude with several examples.
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