Changyu Ren, Zhizhang Wang
This paper establishes the global curvature estimate for the $n-2$ curvature equation with the general right hand side which partially solves this longstanding problem.
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In this paper, we establish a curvature estimate for semi-convex solutions of Hessian equations in hyperbolic space. We also obtain a curvature estimate for admissible solutions to prescribed curvature measure type problem in hyperbolic space. A crucial ingredient in both estimates is a concavity inequality for Hessian operator.
In this paper, we establish the curvature estimates for a class of Hessian type equations. Some applications are also discussed.
In this paper, we derive a priori interior Hessian estimates for Lagrangian mean curvature equation if the Lagrangian phase is supercritical and has bounded second derivatives.
Hessian estimates for shrinkers, expanders, translators, and rotators of the Lagrangian Mean Curvature Flow
该研究在超临界拉格朗日相位假设下，得到拉格朗日平均曲率流四类特殊解的内部Hessian估计，并将结果推广至更广泛的拉格朗日平均曲率型方程，丰富了相关几何分析理论。
The Dirichlet problem for Hessian quotient type curvature equations in Minkowski space
针对非凸区域，在不假设下解和Serrin型条件下建立先验估计，证明闵可夫斯基空间中一类Hessian商型曲率方程Dirichlet问题的存在性。
The existence of $k$-convex hypersurface for a class of Hessian curvature equations
研究一类 Hessian 曲率方程闭星形超曲面存在性，结合先验估计与连续性方法建立 k - 凸超曲面存在唯一性，通过常秩定理证其严格凸。
Guan-Ren-Wang established the curvature estimate of convex hypersurface satisfying the Weingarten curvature equation $σ_{k}(κ(X)) = f(X,ν(X))$. In this note, we give a simple proof of this result.
Hessian estimates for Lagrangian mean curvature equation with Lipschitz critical and supercritical phases
本文提出新策略，结合Allard型正则性定理与几何测度论等方法，在锐利的Lipschitz临界和超临界相位条件下，获得了Lagrangian平均曲率方程解的内部Hessian估计。
In this paper, we discuss the more general Hessian inequality $σ_{k}^{\frac{1}{k}}(λ(D_i (A\left(|Du|\right) D_j u)))\geq f(u)$ including the Laplacian, p-Laplacian, mean curvature, Hessian, k-mean curvature operators, and provide a necessary and sufficient condition on the global solvability, which can be regarded as generalized Keller-Osserman conditions.
A functional inequality between Hessians in spaces with non-zero curvature
该研究将正函数平方根与对数Hessian间的函数不等式推广至非零曲率空间，证明了其成立，扩展了原有结果的适用范围。
The curvature estimates of $k$ curvature equations for general right hand side is a longstanding problem. In this paper, we totally solve the $n-1$ case and we also discuss some applications for our estimate.
In this paper, we propose a coupled system of complex Hessian equations which generalizes the equation for constant scalar curvature Kähler (cscK) metrics. We show this system can be realized variationally as the Euler-Lagrange equation of a Hessian version of the Mabuchi K-energy in an infinite dimensional space of $k$-Hessian potentials, which can be seen as an infinite dimensional Riemannian manifold with negative sectional curvature. Finally, we prove an a priori $C^0$-estimate for this system which depends on the Entropy, which generalizes a fundamental result of Chen and Cheng for cscK m…
The main result of this paper gives a plenary proof on the curvature estimates for $k$ curvature equations with general right hand sides with $n<2k$ based on a concavity inequality. We further give a explicit lower bound of the inequality.
The curvature estimates of quotient curvature equation do not always exist even for convex setting \cite{GRW}. Thus it is natural question to find other type of elliptic equations possessing curvature estimates. In this paper, we discuss the existence of curvature estimate for fully nonlinear elliptic equations defined by symmetric polynomials, mainlly, the linear combination of elementary symmetric polynomials.
Translating solutions and the entire Hessian curvature flow in Minkowski space
该文研究Minkowski空间非紧类空超曲面的$k$-Hessian曲率流，证明了给定渐近行为的平移解存在性，以及满足条件的严格凸初始超曲面的曲率流全局存在且归一化后收敛到平移解。
A simple proof of curvature estimates for the n-1 Hessian equation
针对Ren和Wang已证明的n-1型曲率方程曲率估计，本研究提供了该定理的一个更简单的证明方法。
In this paper, complex Hessian equation over Kähler manifold was studied. Under the condition that the underline Kähler manifold has non-negative holomorphic bisectional curvature, the existence and regularity of the solution was proved.
$C^2$ estimates for $k$-Hessian equations and a rigidity theorem
本文通过证明半凸条件下 $k$-Hessian 算子的凹性不等式，建立相关方程解的内部估计与 Liouville 型结果，并简化 $k$-曲率方程全局曲率估计的证明。
Second boundary value problem for the Hessian curvature flow
本文研究了严格凸超曲面在第二边界条件下沿$k$-Hessian曲率流的演化，通过正交不变性技术克服边界$C^2$估计困难，证明了流的长时间存在性及收敛至平移解，推广了已有Gauss曲率流结果。
The paper introduces a new differential-geometric system which originates from the theory of $m$-Hessian operators. The core of this system is a new notion of invariant differentiation on multidimensional surfaces. This novelty gives rise to the following absolute geometric invariants: invariant derivatives of the surface position vector, an invariant connection on a surface via subsurface, curvature matrices of a hypersurface and its normal sections, $p$-curvatures and $m$-convexity of a hypersurface, etc. Our system also produces a new interpretation of the classic geometric invariants and o…
Dirichlet problem for degenerate Hessian quotient type curvature equations
本文研究退化Hessian商型曲率方程的Dirichlet问题，在特定正则性条件下证明 $C^{1,1}$ 图形超曲面的存在唯一性，并给出退化Hessian型方程在最优条件下的二阶导数估计。
The existence of $(\mathbf{p}, k)$-convex hypersurfaces for a class of Hessian quotient type curvature equations
本文研究了一类Hessian商型曲率方程中闭合星形超曲面的存在性，结合先验估计与连续方法，证明了非齐次和齐次方程的(p,k)-凸超曲面存在性和唯一性，并利用新发现的『逆凸性』性质，证明了常秩定理，从而获得严格凸解的存在性和唯一性。
We prove the symmetry of solutions to overdetermined problems for a class of fully nonlinear equations, namely Hessian quotient equations and Hessian quotient curvature equations. Our approach is based on establishing a Rellich-Pohozaev type identity for Hessian quotient equations and using a P function. Our result generalizes the overdetermined problems for k-Hessian equations and k-curvature equations.
Sharp Hessian inequalities and monotonicity for Green's functions of positively curved Einstein manifolds
该研究针对正曲率爱因斯坦流形的格林函数，证明了其尖锐黑塞不等式及相关单调性公式，扩展了Park的结果，并给出几何应用。
Hessian estimates for Lagrangian mean curvature equation with sharp Lipschitz phase
本文研究了具有尖锐Lipschitz相位的Lagrangian平均曲率方程，建立了凸解和超临界相位解的先验内部$C^{1,1}$估计，并给出了非Lipschitz情况下的反例，进而推导出$C^0$粘性解的内部$C^{2,\alpha}$正则性。
We prove global and local upper bounds for the Hessian of log positive solutions of the heat equation on a Riemannian manifold. The metric is either fixed or evolves under the Ricci flow. These upper bounds supplement the well-known global lower bound.
Starshaped compact hypersurfaces in warped product manifolds II: a class of Hessian type equations
本文通过导出全局曲率估计，证明了一类星形紧致超曲面的存在性，将既有结果从欧几里得空间推广至 Riemannian 扭曲积，并利用类似论证建立了相关完全非线性椭圆偏微分方程容许解的内部二阶先验估计。
We find sharp bounds for the norm inequality on a Pseudo-hermitian manifold, where the L^2 norm of all second derivatives of the function involving horizontal derivatives is controlled by the L^2 norm of the sub-Laplacian. Perturbation allows us to get a-priori bounds for solutions to sub-elliptic PDE in non-divergence form with bounded measurable coefficients. The method of proof is through a Bochner technique. The Heisenberg group is seen to be en extremal manifold for our inequality in the class of manifolds whose Ricci curvature is non-negative.
Hessian operators, overdetermined problems, and higher order mean curvatures: symmetry and stability results
本文将Serrin对称性结果与Alexandrov肥皂泡定理的联系扩展至Hessian算子超定问题与常高阶平均曲率边界，提供新对称性结果、定量稳定性估计及多种替代证明。
In this paper, we consider the inverse hessian quotient curvature flow with star-shaped initial hypersurface in anti-de Sitter-Schwarzschild manifold. We prove that the solution exists for all time, and the second fundamental form converges to identity exponentially fast.
Hessian matrix estimates of heat-type equations via Bismut-Stroock Hessian formula
该研究借助Bismut型Hessian公式推导黎曼流形上热型方程的显式全局Hessian矩阵估计，并将其应用于得到新型反向弱Harnack不等式与特征函数逐点Hessian估计。
In this paper we derive Cheng-Yau, Li-Yau, Hamilton estimates for Riemannian manifolds with Bakry-Emery Ricci curvature bounded from below, and also global and local upper bounds, in terms of Bakry-Emery Ricci curvature, for the Hessian of positive and bounded solutions of the weighted heat equation on a closed Riemannian manifold.
Hessian estimates for the conjugate heat equation coupled with the Ricci flow
本文研究耦合 Ricci 流的共轭热方程，给出其正解 Hessian 的局部及全局上界估计。
The interpolation method for the complex Hessian equation on compact Kähler manifolds
本文在紧致Kähler流形上研究复Hessian方程，通过约束双截曲率与解的振荡，利用插值论证而非爆破技术获得梯度估计，并应用于右端$L^1$逼近1的情形。
We establish interior $C^2$ estimates for convex solutions of scalar curvature equation and $σ_2$-Hessian equation. We also prove interior curvature estimate for isometrically immersed hypersurfaces $(M^n,g)\subset \mathbb R^{n+1}$ with positive scalar curvature. These estimates are consequences of an interior estimate for these equations obtained under a weakened condition.
Pogorelov type estimates for $(n-1)$-Hessian equations and related rigidity theorems
本文通过建立 (n-1)-Hessian 方程容许解的 Pogorelov 型 C^2 估计，在二次增长条件下证明了相应刚性定理，从而肯定回答了 Chang-Yuan 提出的 k-Hessian 方程公开问题在 k=n-1 时的情形。
Let $(X,ω)$ be a compact Kähler manifold of dimension $n$, and fix $1\leq m\leq n.$ We prove that the complex Hessian equation $(ω+dd^cφ)^m\wedge ω^{n-m}=fω^n$, with $0<f\in \mathcal{C}^{\infty}(X)$ has a smooth admissible solution $ φ\in \mathcal{C}^{\infty}(X)$. This was previously known to hold when $(X,ω)$ has non negative holomorphic bisectional curvature.
In this paper, we continue our investigations into the global theory of oblique boundary value problems for augmented Hessian equations. We construct a global barrier function in terms of an admissible function in a uniform way when the matrix function in the augmented Hessian is only assumed regular. This enables us to derive global second derivative estimates in terms of boundary estimates which are then obtained by strengthening the concavity or monotonicity conditions in our previous work on the strictly regular case. Finally we give some applications to existence theorems which embrace st…
In this paper, we prove interior gradient estimates for the Lagrangian mean curvature equation, if the Lagrangian phase is critical and supercritical and $C^{2}$. Combined with the a priori interior Hessian estimates proved in [Bha21, Bha22], this solves the Dirichlet boundary value problem for the critical and supercritical Lagrangian mean curvature equation with $C^0$ boundary data. We also provide a uniform gradient estimate for lower regularity phases that satisfy certain additional hypotheses.
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…
The $p$-th dual Minkowski problem for the $k$-torsional rigidity corresponding to a $k$-Hessian equation
本文提出第p次对偶Minkowski问题，将其转化为非线性偏微分方程，并证明了光滑解的存在性。
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 consider degenerate Monge-Ampère equations on compact Hessian manifolds. We establish compactness properties of the set of normalized quasi-convex functions and show local and global comparison principles for twisted Monge-Ampère operators. We then use the Perron method to solve Monge-Ampère equations whose RHS involves an arbitrary probability measure, generalizing works of Cheng-Yau, Delanoë, Caffarelli-Viaclovsky and Hultgren-Önnheim. The intrinsic approach we develop should be useful in deriving similar results on mildly singular Hessian varieties, in line with the Strominger-Yau-Zaslow…
We consider the problem of finding complete conformal metrics with prescribed curvature functions of the Einstein tensor and of more general modified Schouten tensors. To achieve this, we reveal an algebraic structure of a wide class of fully nonlinear equations. Our method is appropriate and delicate as shown by a topological obstruction. Finally, we discuss Hessian equations and Weingarten equations by confirming a key assumption.
Construction of Twice Differentiable Functions with Continuous Laplacian and Bounded Hessian
本文构造了$\mathbb{R}^n$中具有连续Laplacian和有界Hessian的二次可微函数的例子，并将该构造方法推广应用于更高阶可微性、Monge-Ampère方程及超曲面平均曲率方程。
In this paper, we consider the Neumann problem of a class of mixed complex Hessian equations, and establish the global C^1 estimates a nd reduce the global second derivative estimate to the estimate of double normal second derivatives on the boundary. In particular, we can prove the global C^2 estimates and the existence theorems when k=n.
Applying ideas of fractional analogue of Monge-Ampére operator by L. Caffarelli and F. Charro, we consider an analogue of fractional k-Hessian operators expressed as concave envelopes of fractional linear operators, and reproduce the same regularity results when k=2. Under the set up of global solutions prescribing data at infinity and global barriers, the key estimate is to prove that fractional 2-Hessian operator is strictly elliptic. Then we can apply nonlocal Evans-Krylov theorem to prove such solutions are classical.
$C^{1,1}$ Regularity Global Estimates for Homogeneous Complex Hessian Equations on Punctured Domains
本文通过引入复线性向量场生成的辅助函数，将全局实 Hessian 估计归结到边界，证明了穿孔域上齐次复 Hessian 方程 Green 函数的 $C^{1,1}$ 正则性，并推广至复 Monge-Ampère 情形和外部问题。
We consider a partial differential equation that arises in the coarse-grained description of epitaxial growth processes. This is a parabolic equation whose evolution is governed by the competition between the determinant of the Hessian matrix of the solution and the biharmonic operator. This model might present a gradient flow structure depending on the boundary conditions. We first extend previous results on the existence of stationary solutions to this model for Dirichlet boundary conditions. For the evolution problem we prove local existence of solutions for arbitrary data and global existe…
We prove a general inequality for mixed Hessian measures by global arguments. Our method also yields a simplification for the case of complex Monge-Ampère equation. Exploiting this and using Kołodziej's mass concentration technique we also prove the uniqueness of the solutions to the complex Hessian equation on compact Kähler manifolds in the case of probability measures vanishing on $m$-polar sets.
In this paper, we study Hessian equations with prescribed contact angle boundary value or oblique derivative boundary value and finally derive the a priori global gradient estimate for the admissible solutions.
In this paper, we prove some rigidity theorems for the entire 2-convex solutions of 2-Hessian equation in Euclidean space. As an application, we obtain a Bernstein type theorem for global special Lagrangian graphs.
In this paper, we consider the $k$-Hessian equation $S_{k}(D^{2}u)=b(x)f(u)\mbox{ in }Ω,\,u=+\infty \mbox{ on }\partialΩ$, where $Ω$ is a smooth, bounded, strictly convex domain in $\mathbb{R}^{N}$ with $N\geq2$, $b\in \rm C^{\infty}(Ω)$ is positive in $Ω$ and may be singular or vanish on the boundary, $f\in C^{\infty}(0,\infty)\cap C[0, +\infty)$ (or $f\in C^{\infty}(\mathbb{R})$) is positive and increasing on $[0, +\infty)$ (or $\mathbb{R}$) and satisfies the Keller-Osserman type condition. We first supply an upper and lower solution method of classical $k$-convex large solutions to the abov…
In this paper, we establish global C^2 estimates for a class of mixed Hessian equations with Neumann boundary condition, and obtain the existence theorem of k-admissible solutions for the classical Neumann problem of these mixed Hessian equations.
The $J$-equation proposed by Donaldson is a complex Hessian quotient equation on Kähler manifolds. The solvability of the $J$-equation is proved by Song-Weinkove to be equivalent to the existence of a subsolution. It is also conjectured by Lejmi-Szekelyhidi to be equivalent to a stability condition in terms of holomorphic intersection numbers as an analogue of the Nakai-Moishezon criterion in algebraic geometry. The conjecture is recently proved by Chen under a stronger uniform stability condition. In this paper, we establish a Nakai-Moishezon type criterion for pairs of Kähler classes on anal…
In this paper, we obtain some important inequalities of Hessian quotient operators, and global $C^2$ estimates of the Neumann problem of Hessian quotient equations. By the method of continuity, we establish the existence theorem of $k$-admissible solutions of the Neumann problem of Hessian quotient equations.
The Pogorelov estimates for degenerate curvature equations
该研究建立了退化预定k-曲率方程与k-Hessian方程的Pogorelov型估计，研究了Dirichlet问题解的内部C1,1正则性，还改进了双曲空间中渐近Plateau型问题的存在性定理。
In this paper we introduce new symmetrization with respect to mixed volume or anisotropic curvature integral, which generalizes the one with respect to quermassintegral due to Talenti and Tso. We show a Pólya-Szego type principle for such symmetrization -- it diminishes the anisotropic Hessian integral for quasi-convex functions. We achieve this by a systematic study of invariants on non-symmetric matrices with real eigenvalues and the higher order anisotropic mean curvatures of level sets, which may be of independent interest. As applications, we establish a comparison principle for anisotrop…
In this paper, we consider the Dirichlet problem for a new class of augmented Hessian equations. Under sharp assumptions that the matrix function in the augmented Hessian is regular and there exists a smooth subsolution, we establish global second order derivative estimates for the solutions to the Dirichlet problem in bounded domains. The results extend the corresponding results in the previous paper [11] from the Monge-Ampere type equations to the more general Hessian type equations.
In this paper a new class of modified-Hessian equations, closely related to the Optimal Transportation Equation, will be introduced and studied. In particular, the existence of globally smooth, classical solutions of these equations satisfying the second boundary value problem will be proven. This proof follows a standard method of continuity argument, which subsequently requires various a priori estimates to be made on classical solutions. These estimates are modifications and generalise the corresponding estimates of Trudinger and Wang for the Optimal Transportation Equation. Of particular n…
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