Yuzhou Fang, Chao Zhang
We consider a class of generalized nonlocal $p$-Laplacian equations. We find some proper structural conditions to establish a version of nonlocal Harnack inequalities of weak solutions to such nonlocal problems by using the expansion of positivity and energy estimates.
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The main result of this paper is a nonlocal version of Harnack's inequality for a class of parabolic nonlocal equations. We additionally establish a weak Harnack inequality as well as local boundedness of solutions. None of the results require the solution to be globally positive.
A sharp double-sided Harnack bound is derived for positive solutions of a fractional order heat equation.
We state and prove a general Harnack inequality for minimizers of nonlocal, possibly degenerate, integro-differential operators, whose model is the fractional p-Laplacian.
We establish Harnack's estimates for positive weak solutions to a mixed local and nonlocal doubly nonlinear parabolic equation. All results presented in this paper are provided together with quantitative estimates.
Harnack inequality for doubly nonlinear mixed local and nonlocal parabolic equations
本文针对双重非线性混合局部与非局部抛物型方程，利用比较原理、局部有界性估计和正性扩张方法，建立了非负弱解的Harnack不等式。
Weak Harnack estimates for a doubly nonlinear nonlocal p-Laplace equation
针对双重非线性非局部p-Laplace方程的弱上解，建立了带最优抛物尾的新型弱Harnack估计，利用正性扩张和测度理论，仅需局部正性，凸显非局部特征。
Harnack inequality for nonlocal problems with non-standard growth
本文基于作者此前相关研究，证明了具有非标准增长的非局部问题的局部极小值与弱解的完整Harnack不等式，核心辅助结果为对应De Giorgi类函数的局部有界性及弱Harnack不等式。
We prove the Harnack inequality for general nonlocal elliptic equations with zero order terms. As an application we prove the existence of the principal eigenvalue in general domains. Furthermore, we study the eigenvalue problem associated to the existence of self-similar solutions to the parabolic problem and provide estimates on the decay rate.
Nonlocal Harnack inequality in a disconnected region
本文在不连通区域中建立非局部方程弱解的Harnack不等式，比较解在不同连通分支上的值，并给出基于局部化极大值原理和Poisson核估计的两种证明方法。
Nonlocal intrinsic Harnack estimates
本文把DiBenedetto内蕴Harnack估计推广至分数阶p-Laplacian型积分微分方程，建立内蕴表示型非局部估计，并证明p>2时非负局部解满足非局部问题独有的强极大值原理，类似结果亦适用于多孔介质型非局部方程。
Mixed Local-Nonlocal Parabolic Equations in Heisenberg Group : Harnack Inequality with an Optimal Tail
本文通过正性扩展方法和聚类引理，证明了海森堡群上线性混合局部-非局部抛物方程具有最优尾部的哈纳克不等式，避免了Moser迭代和对数估计。
Harnack estimates for nonlocal drift-diffusion equations
本文研究带漂移项的非局部扩散方程，采用 DeGiorgi 类式测度论方法，首次建立其 Harnack 估计，并改进 Hölder 正则性结果，同时得到椭圆情形的非局部弱 Harnack 估计。
Geometric aspects of the Harnack Inequality for a nonlocal heat equation
本文揭示分数热方程正解的精确双边 Harnack 界与高维圆形几何的关联，并推广了前人结果。
This article proves a weak Harnack inequality with a tail term for sign changing supersolutions of a mixed local and nonlocal parabolic equation. Our argument is purely analytic. It is based on energy estimates and the Moser iteration technique. Instead of the parabolic John-Nirenberg lemma, we adopt a lemma of Bombieri to the mixed local and nonlocal parabolic case. To this end, we prove an appropriate reverse Hölder inequality and a logarithmic estimate for weak supersolutions.
Harnack estimates for the nonlocal Trudinger equation
研究非局部Trudinger方程的逐点正则性理论，通过改编精细德乔治 - 莫泽机制，在最优尾条件下建立定量上界及抛物型哈拿克不等式，克服非局部双非线性框架技术难题。
We prove a Harnack inequality for functions which, at points of large gradient, are solutions of elliptic equations with unbounded drift.
We establish a version of the Harnack inequality for the Jordan-Kinderlehrer-Otto scheme of the heat equation on the flat torus.
We give a direct analytic proof of the classical Boundary Harnack inequality for solutions to linear uniformly elliptic equations in either divergence or non-divergence form.
Harnack-type estimates for nonlocal double phase functionals
针对非局部双相位泛函的局部极小化子，建立了Harnack型不等式，通过同心模估计解决了(p,q)-增长与低可积性指数的匹配问题，首次在自然结构条件下给出完整理论。
The nonlocal Harnack inequality for antisymmetric functions: an approach via Bochner's relation and harmonic analysis
本文利用 Bochner 关系将奇函数的一维 Fourier 变换与径向函数的三维 Fourier 变换相联系，把分数阶 Laplacian 的反对称函数 Harnack 不等式推广至更一般的非局部椭圆算子，将边界型不等式转化为内部不等式。
This paper will develop a Li-Yau-Hamilton type differential Harnack estimate for positive solutions to the Newell-Whitehead equation on $\mathbb{R}^n$. We then use our LYH-differential Harnack inequality to prove several properties about positive solutions to the equation, including deriving a classical Harnack inequality, and characterizing standing solutions and traveling wave solutions.
We establish a Harnack inequality of fractional Laplace equations without imposing sign condition on the coefficient of zero order term via the Moser's iteration and John-Nirenberg inequality.
We give a sup $\times$ inf inequality for an elliptic equation.
On The Weak Harnack Estimate For Nonlocal Equations
本文针对以非局部 Trudinger 方程为模型的双重非线性非局部方程，利用适配非局部框架的正性扩张论证建立弱 Harnack 估计，并避开 Moser 迭代等经典技术。
In 1957, De Giorgi [3] proved the Hölder continuity for elliptic equations in divergence form and Moser [7] gave a new proof in 1960. Next year, Moser [8] obtained the Harnack inequality. In this note, we point out that the Harnack inequality was hidden in [3].
Harnack-type inequalities and traveling waves for non-cooperative nonlocal diffusion systems
本文针对实数域上弱耦合非局部扩散系统，建立了不依赖耦合矩阵合作性或不可约性的ℓ¹-范数哈纳克型不等式，结合重标度论证等方法，得到了一类带网络结构的非合作非局部扩散系统行波的最小波速存在性及波剖面负无穷处的精确渐近行为。
We prove a boundary Harnack inequality for nonlocal elliptic operators $L$ in non-divergence form with bounded measurable coefficients. Namely, our main result establishes that if $Lu_1=Lu_2=0$ in $Ω\cap B_1$, $u_1=u_2=0$ in $B_1\setminusΩ$, and $u_1,u_2\geq0$ in $\mathbb R^n$, then $u_1$ and $u_2$ are comparable in $B_{1/2}$. The result applies to arbitrary open sets $Ω$. When $Ω$ is Lipschitz, we show that the quotient $u_1/u_2$ is Hölder continuous up to the boundary in $B_{1/2}$.
We prove Harnack's inequality for bounded weak solutions to quasilinear second order elliptic equations with generalized Orlicz growth conditions. Our approach covers new cases of variable exponent and (p,q) growth conditions.
This paper is concerned with nonlinear elliptic equations in nondivergence form where the operator has a first order drift term which is not Lipschitz continuous. Under this condition the equations are nonhomogeneous and nonnegative solutions do not satisfy the classical Harnack's inequality. This paper presents a new type of generalization of the classical Harnack's inequality for such equations. As a corollary we obtain the optimal Harnack type of estimate for p(x)-harmonic functions which quantifies the strong minimum principle.
A Differential Harnack Inequality for the FitzHugh-Nagumo Equation
本文针对ℝⁿ上FitzHugh-Nagumo方程的正解建立了Li-Yau-Hamilton型微分Harnack估计，并借此证明了该方程正解的经典Harnack不等式及行波解速度下界等性质。
We prove an invariant Harnack's inequality for operators in non-divergence form structured on Heisenberg vector fields when the coefficient matrix is uniformly positive definite, continuous, and symplectic. The method consists in constructing appropriate barriers to obtain pointwise-to-measure estimates for supersolutions in small balls, and then invoking the axiomatic approach from [DGL08] to obtain Harnack's inequality.
This paper is concerned with semilinear equations in divergence form \[ \diver(A(x)Du) = f(u) \] where $f :\R \to [0,\infty)$ is nondecreasing. We prove a sharp Harnack type inequality for nonnegative solutions which is closely connected to the classical Keller-Osserman condition for the existence of entire solutions.
The weak Harnack inequality for $L^p$-viscosity supersolutions of fully nonlinear second-order uniformly parabolic partial differential equations with unbounded coefficients and inhomogeneous terms is proved. It is shown that Hölder continuity of $L^p$-viscosity solutions is derived from the weak Harnack inequality for $L^p$-viscosity supersolutions. The local maximum principle for $L^p$-viscosity subsolutions and the Harnack inequality for $L^p$-viscosity solutions are also obtained. Several further remarks are presented when equations have superlinear growth in the first space derivatives.
Integral Harnack inequality and expansion of positivity for fractional porous medium equation
本文在最优尾部条件下，证明了快速扩散分数多孔介质方程非负弱解的积分Harnack不等式与正性扩张性质。
We study viscosity solutions to degenerate and singular elliptic equations of $p$-Laplacian type on Riemannian manifolds. The Krylov-Safonov type Harnack inequality for the $p$-Laplacian operators with $1<p<\infty$ is established on the manifolds with Ricci curvature bounded from below based on ABP type estimates. We also prove the Harnack inequality for nonlinear $p$-Laplacian type operators assuming that a nonlinear perturbation of Ricci curvature is bounded below.
For a general class of divergence type quasi-linear degenerate parabolic equations with measurable coeffcients and lower order terms from non-linear Kato-type classes, we prove local boundedness and continuity of solutions, and the intrinsic Harnack inequality for positive solutions.
We consider viscosity solutions to nonlinear uniformly parabolic equations in nondivergence form on a Riemannian manifold $M$, with the sectional curvature bounded from below by $-κ$ for $κ\geq 0$. In the elliptic case, Wang and Zhang \cite{WZ} recently extended the results of \cite{Ca} to nonlinear elliptic equations in nondivergence form on such $M$, where they obtained the Harnack inequality for classical solutions. We establish the Harnack inequality for nonnegative {\it viscosity solutions} to nonlinear uniformly {\it parabolic equations} in nondivergence form on $M$. The Harnack inequali…
We give some estimates of type sup $\times$ inf on Riemannian manifold of dimension 5.
We deal with a wide class of nonlinear integro-differential problems in the Heisenberg-Weyl group $\mathbb{H}^n$, whose prototype is the Dirichlet problem for the $p$-fractional subLaplace equation. These problems arise in many different contexts in quantum mechanics, in ferromagnetic analysis, in phase transition problems, in image segmentations models, and so on, when non-Euclidean geometry frameworks and nonlocal long-range interactions do naturally occur. We prove general Harnack inequalities for the related weak solutions. Also, in the case when the growth exponent is $p=2$, we investigat…
Stability results for nonlocal Serrin-type problems, antisymmetric Harnack inequalities, and geometric estimates
本文研究了非局部偏微分方程的对称性与几何性质，包括由分数阶拉普拉斯算子驱动的超定问题、反对称解的 Harnack 不等式及分数阶平均曲率的几何估计。
The Parabolic Harnack Inequality on Weighted Riemannian Manifolds
基于Grigor'yan的方法，对一大类抛物型微分算子建立了加权黎曼流形上的抛物型Harnack不等式。
We consider weak solutions to $$-Δ_pu+a(x,u)|\nabla u|^q=f(x,u),$$ with $p>1$, $q\geq\max\,\{p-1,1\}$. We exploit the Moser iteration technique to prove a Harnack comparison inequality for $C^1$ weak solutions. As a consequence we deduce a strong comparison principle.
We show that the quotient of two positive harmonic functions vanishing on the boundary of a $C^{k,α}$ domain is of class $C^{k,α}$ up to the boundary.
In this paper we prove an invariant Harnack inequality on Carnot-Carathéodory balls for fractional powers of sub-Laplacians in Carnot groups. The proof relies on an "abstract" formulation of a technique recently introduced by Caffarelli and Silvestre. In addition, we write explicitly the Poisson kernel for a class of degenerate subelliptic equations in product-type Carnot groups.
Harnack inequality for degenerate fully nonlinear parabolic equations
该研究将p>2的p-抛物方程推广至非散度形式的退化完全非线性抛物方程，证明了非负解的内蕴Harnack不等式与非负上解的弱Harnack不等式，给出了已有散度形式相关结果的非散度形式对应结论。
We study energy functionals obtained by adding a possibly discontinuous potential to an interaction term modeled upon a Gagliardo-type fractional seminorm. We prove that minimizers of such non-differentiable functionals are locally bounded, Hölder continuous, and that they satisfy a suitable Harnack inequality. Hence, we provide an extension of celebrated results of M. Giaquinta and E. Giusti to the nonlocal setting. To do this, we introduce a particular class of fractional Sobolev functions, reminiscent of that considered by E. De Giorgi in his seminal paper of 1957. The flexibility of these …
We study unbounded weak supersolutions of elliptic partial differential equations with generalized Orlicz (Musielak--Orlicz) growth. We show that they satisfy the weak Harnack inequality with optimal exponent provided that they belong to a suitable Lebesgue or Sobolev space. Furthermore, we establish the sharpness of our central assumptions.
We discuss the problem how "bad" may be lower-order coefficients in elliptic and parabolic second order equations to ensure some qualitative properties of solution such as strong maximum principle, Harnack's inequality, Liouville's theorem. The answers are given in terms of the Lebesgue spaces and the Morrey spaces.
In this paper, we establish a scale invariant Harnack inequality for some inhomogeneous parabolic equations in a suitable intrinsic geometry dictated by the nonlinearity. The class of equations that we consider correspond to the parabolic counterpart of the equations studied by Julin in [10] where a generalized Harnack inequality was obtained which quantifies the strong maximum principle. Our version of parabolic Harnack (see Theorem 1.2) when restricted to the elliptic case is however quite different from that in [10]. The key new feature of this work is an appropriate modification of the sta…
The weak Harnack inequality and the rigidity of the anisotropic Trudinger's equation
该研究针对各向异性特鲁丁格方程非负弱超解证明了局部弱哈纳克不等式，给出了绕过克里洛夫-萨丰诺夫覆盖论证的哈纳克不等式证明，并确定了巴伦布拉特型剖面。
We study local regularity properties for solutions of linear, non-uniformly elliptic equations. Assuming certain integrability conditions on the coefficient field, we prove local boundedness and Harnack inequality. The assumed integrability assumptions are essentially sharp and improve upon classical results by Trudinger [ARMA 1971]. We then apply the deterministic regularity results to the corrector equation in stochastic homogenization and establish sublinearity of the corrector.
In this paper we consider a class of prescribing curvature type equations on half Euclidean balls. Under suitable assumptions on the scalar curvature function and boundary mean curvature function we prove a min-max type inequality and the corresponding energy estimates.
We consider weak solutions of degenerate second order partial differential equations of Kolmogorov-Fokker-Planck type with measurable coefficients in divergence form. We give a geometric statement of the Harnack inequality recently proven by Golse, Imbert, Mouhot and Vasseur. As a corollary we obtain a strong maximum principle.
Elliptic Harnack's inequality for a singular nonlinear parabolic equation in non-divergence form
本文证明了一类推广标准p-Laplace方程及随机博弈归一化版本的一般抛物方程的椭圆型Harnack不等式，无需内在等待时间，且两侧时间层相同。
We extend some classical results dealing with boundary Harnack inequatilities to a class of quasilinear elliptic equations and derive some new estimates for solutions of such equations with an isolated singularity on the boundary of a domain.
We consider second-order linear parabolic operators in non-divergence form that are intrinsically defined on Riemannian manifolds. In the elliptic case, Cabré proved a global Krylov-Safonov Harnack inequality under the assumption that the sectional curvature of the underlying manifold is nonnegative. Later, Kim improved Cabré's result by replacing the curvature condition by a certain condition on the distance function. Assuming essentially the same condition introduced by Kim, we establish Krylov-Safonov Harnack inequality for nonnegative solutions of the non-divergent parabolic equation. This…
In this paper, we obtain boundary Harnack estimates and comparison theorem for nonnegative solutions to the linearized Monge-Ampère equations under natural assumptions on the domain, Monge-Ampère measures and boundary data. Our results are boundary versions of Caffarelli and Gutiérrez's interior Harnack inequality for the linearized Monge-Ampère equations. As an application, we obtain sharp upper bound and global $L^p$-integrability for the Green's function of the linearized Monge-Ampère operator.
Time-insensitive nonlocal parabolic Harnack estimates
本文针对非局部抛物方程建立不受等待时间现象影响的新型全局解 Harnack 估计，并证明局部解情形下等待时间不可避免。
This paper deals with two separate but related results. First we consider weak solutions to a parabolic operator with Hörmander vector fields. Adapting the iteration scheme of Jürgen Moser for elliptic and parabolic equations in $\mathbb{R}^n$ we show a parabolic Harnack inequality. Then, after proving the Harnack inequality for weak solutions to equations of the form $u_t = \sum X_i (a_{ij} X_j u)$ we use this to show Hölder continuity. We assume the coefficients are bounded and elliptic. The iteration scheme is a tool that may be adapted to many settings and we extend this to nonlinear parab…
The parabolic Harnack inequality on non-local Dirichlet spaces in the view of pure analysis
该研究针对无消亡项的正则Dirichlet型，用纯分析的Nash与Moser方法证明抛物Harnack不等式（PHI），推导其重要性质，并结合前期弱Harnack不等式结果扩充了PHI的等价刻画范围。
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