Sun-Sig Byun, Jeongmin Han, Jehan Oh
This paper concerns fully nonlinear elliptic obstacle problems with oblique boundary conditions. We investigate the existence, uniqueness and $W^{2,p}$-regularity results by finding approximate non-obstacle problems with the same oblique boundary condition and then making a suitable limiting process.
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In this paper we introduce an integer-valued degree for second order fully nonlinear elliptic operators with nonlinear oblique boundary conditions. We also give some applications to the existence of solutions of certain nonlinear elliptic equations arising from a Yamabe problem with boundary and reflector problems.
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.
Fully nonlinear elliptic PDEs in thin domains with oblique-Dirichlet mixed boundary conditions
研究薄域中非线性椭圆型PDE在斜Dirichlet混合边界条件下的渐进行为，引入极限方程中的全局椭圆性条件。
C^{1,α} regularity for a class of singular/degenerate fully nonlinear elliptic equations with oblique boundary conditions
本文研究了一类具有斜边界条件的奇异/退化全非线性椭圆方程的粘性解的全局 $C^{1, α}$ 正则性，扩展了 BKO25 的结果至更广的方程类，包括奇异情形。
Sharp gradient estimates for a class of singular/degenerate fully nonlinear elliptic equations with oblique boundary conditions and Hamiltonian terms
研究一类具斜边界条件和哈密顿项的奇异/退化完全非线性椭圆方程，在一般条件下，于统一框架内建立直至边界的精确 \(C^{1,\alpha}\) 正则性。
$C^{1,α}$ regularity for degenerate fully nonlinear elliptic equations with oblique boundary conditions on $C^1$ domains
本文在C^1域上研究带斜边界条件的退化完全非线性椭圆方程，通过先建立几乎C^1平坦域中的一致边界Hölder估计，再利用扰动与紧性方法证明了粘性解直到边界的尖锐C^{1,α}正则性。
Inspired by the penalization of the domain approach of Lions & Sznitman, we give a sense to Neumann and oblique derivatives boundary value problems for nonlocal, possibly degenerate elliptic equations. Two different cases are considered: (i) homogeneous Neumann boundary conditions in convex, possibly non-smooth and unbounded domains, and (ii) general oblique derivatives boundary conditions in smooth, bounded, and possibly non-convex domains. In each case we give apropriate definitions of viscosity solutions and prove uniqueness of solutions of the corresponding boundary value problems. We prov…
We study the oblique derivative problem for uniformly elliptic equations on cone domains. Under the assumption of axi-symmetry of the solution, we find sufficient conditions on the angle of the oblique vector for Hölder regularity of the gradient to hold up to the vertex of the cone. The proof of regularity is based on the application of carefully constructed barrier methods or via perturbative arguments. In the case that such regularity does not hold, we give explicit counterexamples. We also give a counterexample to regularity in the absence of axi-symmetry. Unlike in the equivalent two dime…
Fully nonlinear elliptic PDEs in thin domains with oblique boundary condition
本研究探讨带斜边界条件的薄区域上的完全非线性椭圆偏微分方程，发现其极限方程含多阶新项，补充了经典诺伊曼情形相关研究的内容。
A Measure-Valued Obstacle Problem for an Obliquely Reflected Diffusion with a Max-Type Payoff
针对非负象限中具有非光滑最大值型收益的斜反射最优停止问题，提出测度值势论形式的障碍问题公式，推导反射Itô-Tanaka恒等式，并证明验证定理。
We show that weak solutions to conormal derivative problem for elliptic equations in divergence form are continuously differentiable up to the boundary provided that the mean oscillations of the leading coefficients satisfy the Dini condition, the lower order coefficients satisfy certain suitable conditions, and the boundary is locally represented by a $C^1$ function whose derivatives are Dini continuous. We also prove that strong solutions to oblique derivative problem for elliptic equations in nondivergence form are twice continuously differentiable up to the boundary if the mean oscillation…
The aim of this paper is to establish $W^2_p$ estimate for non-divergence form second-order elliptic equations with the oblique derivative boundary condition in domains with small Lipschitz constants. Our result generalizes those in [14, 15], which work for $C^{1,α}$ domains with $α> 1-1/p$. As an application, we also obtain a solvability result. An extension to fully nonlinear elliptic equations with the oblique derivative boundary condition is also discussed.
We consider second-order elliptic equations in non-divergence form with oblique derivative boundary conditions. We show that any strong solutions to such problems are twice continuously differentiable up to the boundary provided that the mean oscillations of coefficients satisfy the Dini condition and the boundary is locally represented by a $C^1$ function whose first derivatives are Dini continuous. This improves a recent result in [6]. An extension to fully nonlinear elliptic equations is also presented.
Sharp Hessian estimates for fully nonlinear elliptic equations under relaxed convexity assumptions, oblique boundary conditions and applications
本文利用几何切向方法与 Recession 算子，在弱于凸性的结构假设及斜边界条件下建立完全非线性椭圆方程粘性解的全局 Hessian/BMO 估计，并推广至障碍型问题。
In this paper we give a comprehensive treatment of a two-penalty boundary obstacle problem for a divergence form elliptic operator, motivated by applications to fluid dynamics and thermics. Specifically, we prove existence, uniqueness and optimal regularity of solutions, and establish structural properties of the free boundary. The proofs are based on tailor-made monotonicity formulas of Almgren, Weiss, and Monneau-type, combined with the classical theory of oblique derivative problems.
We prove the natural weighted Calderón and Zygmund estimates for solutions to elliptic and parabolic obstacle problems in nondivergence form with discontinuous coefficients and irregular obstacles. We also obtain Morrey regularity results for the Hessian of the solutions and Hölder continuity of the gradient of the solutions.
We prove gradient estimates for solutions of the oblique derivative problem for a large class of elliptic and parabolic quasilinear PDEs. In particular, we expand on previous work of the author using a maximum principle argument. In addition, we prove estimates for the parabolic problem of evolution via mean curvature with nonzero Neumann data, which seem to be new.
In this paper we establish the optimal interior regularity and the $C^{1,γ}$ smoothness of the regular part of the free boundary in the thin obstacle problem for a class of degenerate elliptic equations with variable coefficients.
Universal regularity estimates for solutions to fully nonlinear elliptic equations with oblique boundary data
本文针对带斜边界条件的完全非线性椭圆方程，通过分析源项可积性、系数VMO假设及边界数据光滑性，建立了粘性解的普遍正则性估计，并在临界情形下得到精确梯度与Schauder型估计。
Riesz potential estimates for non-linear elliptic obstacle problems
研究涉及测度数据的非线性椭圆障碍问题，核心方法是根据里斯势建立解的逐点梯度估计，主要贡献是得到相关估计结果。
We study quasilinear elliptic double obstacle problems with a variable exponent growth when the right-hand side is a measure. A global Calderón-Zygmund estimate for the gradient of an approximable solution is obtained in terms of the associated double obstacles and a given measure, identifying minimal requirements for the regularity estimate.
Fully nonlinear oblique transmission problems: Well-posedness
研究涉及内部方程和界面传输条件均为完全非线性椭圆方程的传输问题，传输条件依赖于界面两侧解的法向导数和切向导数，证明了平坦界面常系数斜传输问题粘性解的存在唯一性。
Existence of stationary solutions to a nonlocal fourth-order elliptic obstacle problem arising from the modelling of microelectromechanical systems with heterogeneous dielectric properties is shown. The underlying variational structure of the model is exploited to construct these solutions as minimizers of a suitably regularized energy, which allows us to weaken considerably the assumptions on the model used in a previous article.
Systems of Fully Nonlinear Degenerate Elliptic Obstacle problems with Dirichlet boundary conditions
本文研究带Dirichlet边界条件的完全非线性退化椭圆障碍问题系统，证明了含互联障碍极小化问题对应完全非线性椭圆系统粘性解的存在唯一性，该系统可应用于有界域最优切换问题等领域。
We consider a nonlinear Neumann problem, with periodic oscillation in the elliptic operator and on the boundary condition. Our focus is on problems posed in half-spaces, but with general normal directions that may not be parallel to the directions of periodicity. As the frequency of the oscillation grows, quantitative homogenization results are derived. When the homogenized operator is rotation-invariant, we prove the Hölder continuity of the homogenized boundary data.
The aim of this paper is twofold: to prove, for L^1-data, the existence and uniqueness of an entropy solution to the obstacle problem for nonlinear elliptic equations with variable growth, and to show some convergence and stability properties of the corresponding coincidence set. The latter follow from extending the Lewy--Stampacchia inequalities to the general framework of L^1.
We deal with a global Calderón-Zygmund type estimate for elliptic obstacle problems of $p$-Laplacian type with measure data. For this paper, we focus on the singular case of growth exponent, i.e. $1<p \le 2-\frac{1}{n}$. In addition, the emphasis of this paper is in obtaining the Lorentz bounds for the gradient of solutions with the use of fractional maximal operators.
Singular elliptic measure data problems with irregular obstacles
本文研究带测度数据和不规则障碍的椭圆问题，在强奇异范围$1<p\le2-1/n$内建立新的比较估计，证明梯度和零阶位势的内蕴估计。
In this paper,we consider the solutions of the non-homogeneous elliptic obstacle problems with Orlicz growth involving measure data. We first establish the pointwise estimates of the approximable solutions to these problems via fractional maximal operators. As a result, we obtain pointwise and oscillation estimates for the gradients of solutions by the non-linear Wolff potentials, and these yield results on $C^{1,α}$-regularity of solutions.
Weighted Orlicz regularity for fully nonlinear elliptic equations with oblique derivative at the boundary via asymptotic operators
该研究针对带斜边界条件的完全非线性椭圆方程，在算子无需凸凹结构的条件下证明了加权Orlicz-Sobolev正则性，还处理了对应障碍问题的加权Orlicz估计，并给出Hessian的加权Orlicz-BMO正则性结果。
Global weighted Lorentz estimates of oblique tangential derivative problems for weakly convex fully nonlinear operators
本研究针对弱化凸性条件下带斜边界条件的完全非线性椭圆方程，推导了其粘性解的加权Lorentz-Sobolev估计，并拓展得到障碍问题解的对应估计及其他应用。
In this paper, we study global regularity for oblique boundary value problems of augmented Hessian equations for a class of general operators. By assuming a natural convexity condition of the domain together with appropriate convexity conditions on the matrix function in the augmented Hessian, we develop a global theory for classical elliptic solutions by establishing global a priori derivative estimates up to second order. Besides the known applications for Monge-Amp`ere type operators in optimal transportation and geometric optics, the general theory here embraces prescribed mean curvature p…
In 1963, Littman, Stampacchia, and Weinberger proved a mean value theorem for elliptic operators in divergence form with bounded measurable coefficients. In the Fermi lectures in 1998, Caffarelli stated a much simpler mean value theorem for the same situation, but did not include the details of the proof. We show all of the nontrivial details needed to prove the formula stated by Caffarelli, and in the course of showing these details we establish some of the basic facts about the obstacle problem for general elliptic divergence form operators, in particular, we show a basic quadratic nondegene…
Our goal in this article is to study the global Lorentz estimates for gradient of weak solutions to $p$-Laplace double obstacle problems involving the Schrödinger term: $-Δ_p u + \mathbb{V}|u|^{p-2}u$ with bound constraints $ψ_1 \le u \le ψ_2$ in non-smooth domains. This problem has its own interest in mathematics, engineering, physics and other branches of science. Our approach makes a novel connection between the study of Calderón-Zygmund theory for nonlinear Schrödinger type equations and variational inequalities for double obstacle problems.
Wolff potential estimates for elliptic obstacle problems with generalized Orlicz growth
研究具有广义Orlicz增长的椭圆障碍问题，通过建立解在Musielak-Orlicz空间的存在性，利用非线性Wolff势导出解的梯度估计，得到解的$C^{1,\alpha}$正则性结果。
We study the obstacle problem with an elliptic operator in nondivergence form with principal coefficients in VMO. We develop all of the basic theory of existence, uniqueness, optimal regularity, and nondegeneracy of the solutions. These results, in turn, allow us to begin the study of the regularity of the free boundary, and we show existence of blowup limits, a basic measure stability result, and a measure-theoretic version of the Caffarelli alternative proven in Caffarelli's 1977 paper "The regularity of free boundaries in higher dimensions."
Gradient potential estimates for elliptic double obstacle problems with Orlicz growth
该研究针对含测度数据的 Orlicz 增长椭圆型双障碍问题，利用分数次极大算子与非线性 Wolff 位势建立解及其梯度的逐点和振荡估计，证明解具有 $C^{1,α}$ 正则性。
We study the regularity of the solution of the double obstacle problem form for fully non linear parabolic and elliptic operators. We show that when the obstacles are sufficiently regular the solution is $C^{1,α}$ in the interior for both the parabolic and the elliptic cases.
Optimal $C^{1,α}$ regularity up to the boundary for fully nonlinear elliptic equations with double phase degeneracy
本文研究了具有双重相退化律和斜边界条件的全非线性椭圆方程粘性解的最优 $C^{1,α}$ 正则性，通过建立几乎 $C^{1}$-平滑域中扰动模型的均匀边界霍尔德估计，结合粘性解的紧性和稳定性框架，得到正则性结果，并确定了当主算子拟凸或拟凹时的最优霍尔德指数。
Gradient regularity for a class of elliptic obstacle problems
该研究针对带障碍约束的非自治积分泛函局部极小值问题，在偏映射系数满足合适Sobolev正则性的条件下，证明了局部极小值的更高可微性与Lipschitz连续性，推进了椭圆障碍问题的梯度正则性研究。
We construct an efficient approach to deal with the global regularity estimates for a class of elliptic double-obstacle problems in Lorentz and Orlicz spaces. The motivation of this paper comes from the study on an abstract result in the viewpoint of the fractional maximal distributions and this work also extends some regularity results proved in \cite{PN_dist} by using the weighted fractional maximal distributions (WFMDs). We further investigate a pointwise estimates of the gradient of weak solutions via fractional maximal operators and Riesz potential of data. Moreover, in the setting of the…
We develop reconstruction schemes to determine penetrable obstacles in a region of \mathbb{R}^{2} or \mathbb{R}^{3} and we consider anisotropic elliptic equations. This algorithm uses oscillating-decaying solutions to the equation. We apply the oscillating-decaying solutions and the Runge approximation property to the inverse problem of identifying an inclusion in an anisotropic elliptic differential equation.
Singular parabolic operators in the half-space with boundary degeneracy: Dirichlet and oblique derivative boundary conditions
该研究针对半空间中带Dirichlet或斜导数边界条件的奇异退化椭圆/抛物算子，推导了特殊参数下的算子形式，证明了L^p估计、可解性及解析半群生成、极大正则性等性质。
A survey on obstacle-type problems for fourth order elliptic operators
本文综述四阶椭圆算子障碍型问题的已知结果与最新研究，结合位势论、变分法、局部化及单调性公式，分析适定性、解正则性与自由边界结构。
We consider second-order elliptic equations with oblique derivative boundary conditions, defined on a family of bounded domains in $\mathbb{C}$ that depend smoothly on a real parameter $λ\in [0,1]$. We derive sharp regularity properties of the solutions in all variables, including the parameter $λ$. More specifically we show that the solution and its derivatives are continuous in all variables, and the Hölder norms of the space variables are bounded uniformly in $λ$.
In this paper, we develop a series of boundary pointwise regularity for Dirichlet problems and oblique derivative problems. As applications, we give direct and simple proofs of the higher regularity of the free boundaries in obstacle-type problems and one phase problems.
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.
An inverse free boundary problem
该研究针对椭圆型与抛物型障碍问题的逆问题，证明了椭圆型障碍问题的Dirichlet-to-Neumann映射的单侧线性化可唯一确定非接触集与障碍，并将抛物型障碍逆问题归约为椭圆型逆问题求解。
The paper is devoted to the study of positive solutions of a second-order linear elliptic equation in divergence form in a domain $D\subseteq \mathbb{R}^n$ that satisfy an oblique boundary condition on a portion of $\partial D$. First, we study the degenerate mixed boundary value problem $$ \begin{cases} Pu=f & \text{in } D, \\ Bu = 0 & \text{on } \partial D_{\mathrm{Rob}}, \\ u=0& \text{on } \partial D_{\mathrm{Dir}}, \end{cases} $$ where $D$ is a bounded Lipschitz domain, $\partial D_{\mathrm{Rob}}$ is a relatively open portion of $\partial D$, $\partial D_{\mathrm{Dir}}$ is a closed set of …
In this paper, we prove the regularity of the free boundary in the Monge-Ampère obstacle problem $\det D^2 v= f(y)χ_{\{v>0\}}. $ By duality, the regularity of the free boundary is equivalent to that of the asymptotic cone of the solution to the singular Monge-Ampère equation $\det D^2 u = 1/f (Du)+δ_0$ at the origin. We first establish an asymptotic estimate for the solution $u$ near the singular point, then use a partial Legendre transform to change the Monge-Ampère equation to a singular, fully nonlinear elliptic equation, and establish the regularity of solutions to the singular elliptic eq…
Mixed type boundary value problem of elliptic equation in a thin domain
本文研究薄新月形区域中带斜导数与狄利克雷混合边界条件的二维椭圆方程，证明了区域塌缩为线段时边值问题具有一致 Schauder 估计并给出渐近估计。
Numerical approximation of the solution of an obstacle problem modelling the displacement of elliptic membrane shells via the penalty method
本文基于 Finite Element Method 研究了模拟椭圆薄膜壳位移的障碍问题，通过逼近罚化版本并耦合罚参数与网格尺寸证明了离散解向原始变分不等式的收敛性，同时验证了 Brezis-Sibony 迭代格式的收敛性。
On a class of thin obstacle-type problems for the bi-Laplacian operator
本文研究了生物拉普拉斯算子的一类薄障碍型问题，通过单调性公式和放大分析，证明了自由边界的分层结果。
We prove a stability estimate of logarithmic type for the inverse problem consisting in the determination of the surface impedance of an obstacle from the scattering amplitude. We present a simple and direct proof which is essentially based on an elliptic Carleman inequality.
We prove the optimal $W^{2, \infty }$ regularity for fully nonlinear elliptic equations with convex gradient constraints. We do not assume any regularity about the constraints; so the constraints need not be $C^1$ or strictly convex. We also show that the optimal regularity holds up to the boundary. Our approach is to show that these elliptic equations with gradient constraints are related to some fully nonlinear double obstacle problems. Then we prove the optimal $W^{2, \infty }$ regularity for the double obstacle problems. In this process, we also employ the monotonicity property for the sec…
Oblique boundary value problems for n-1type augmented Hessian equations
本文针对有界区域上n-1型增广Hessian方程的斜边值问题，在无凸性条件下建立经典椭圆解的全局存在唯一性理论，涵盖多个相关领域的方程应用。
We prove existence and uniqueness of stochastic representations for solutions to elliptic and parabolic boundary value and obstacle problems associated with a degenerate Markov diffusion process. In particular, our article focuses on the Heston stochastic volatility process, which is widely used as an asset price model in mathematical finance and a paradigm for a degenerate diffusion process where the degeneracy in the diffusion coefficient is proportional to the square root of the distance to the boundary of the half-plane. The generator of this process with killing, called the elliptic Hesto…
We study homogenization of a boundary obstacle problem on $ C^{1,α} $ domain $D$ for some elliptic equations with uniformly elliptic coefficient matrices $γ$. For any $ ε\in\mathbb{R}_+$, $\partial D=Γ\cup Σ$, $Γ\cap Σ=\emptyset $ and $ S_ε\subset Σ$ with suitable assumptions,\ we prove that as $ε$ tends to zero, the energy minimizer $ u^ε $ of $ \int_{D} |γ\nabla u|^{2} dx $, subject to $ u\geq φ$ on $ S_{\varepsilon} $, up to a subsequence, converges weakly in $ H^{1}(D) $ to $ \widetilde{u} $ which minimizes the energy functional $\int_{D}|γ\nabla u|^{2}+\int_Σ (u-φ)^{2}_{-}μ(x) dS_{x}$, wh…
We prove the existence and $C^{1,α}$ regularity of solutions to nonlocal fully nonlinear elliptic double obstacle problems. We also obtain boundary regularity for these problems. The obstacles are assumed to be Lipschitz semi-concave/semi-convex functions, and we do not require them to be $C^1$. Our approach is to adapt a penalization method to be applicable to the setting of nonlocal equations and their viscosity solutions.
We discuss some regularity issues in the study of the obstacle problem. In particular, we present a recent result by O. Savin and the author on the regularity of the singular set for the obstacle problem with a fully nonlinear elliptic operator. This survey is based on a lecture by the author at the 8th International Congress of Chinese Mathematicians.
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