Deforming convex hypersurfaces to a hypersurface with prescribed harmonic mean curvature
Huaiyu Jian
利用热流法将环域中的凸超曲面变形为调和平均曲率为给定函数的超曲面。
A heat flow method is used to deform convex hypersurfaces in a ring domain to a hypersurface whose harmonic mean curvature is a prescribed function.
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In this paper, we consider a fully nonlinear curvature flow of a convex hypersurface in the Euclidean n-space. This flow involves k-th elementary symmetric function for principal curvature radii and a function of support function. Under some appropriate assumptions, we prove the long-time existence and convergence of this flow. As an application, we give the existence of smooth solutions to the Orlicz-Christoffel-Minkowski problem.
The mean curvature type hypersurfaces with prescribed gradient image
研究均曲率类型超曲面的存在性，证明在给定梯度像条件下，第二边界值问题有唯一凸解。
Maximal hypersurfaces with prescribed light-like cones in Lorentz-Minkowski space
本文研究洛伦兹-闵氏空间中具有多重光锥的极大超曲面，通过考虑带有多重狄拉克质量的均值曲率方程弱解来构建解。
Starshaped compact hypersurfaces in warped product manifolds I: prescribed curvature equations
本文推导了扭曲积流形中闭的严格星形$(n-2)$-凸超曲面满足预定曲率方程的全局曲率估计，该方法可推广至一般$k$-曲率方程的半凸解及预定曲率测度型方程的$k$-凸解。
For a smooth, closed and uniformly $h$-convex hypersurface $M$ in $\mathbb{H}^{n+1}$, the horospherical Gauss map $G: M \rightarrow \mathbb{S}^n$ is a diffeomorphism. We consider the problem of finding a smooth, closed and uniformly $h$-convex hypersurface $M\subset \mathbb{H}^{n+1}$ whose $k$-th shifted mean curvature $\widetilde{H}_{k}$ ($1\leq k\leq n$) is prescribed as a positive function $\tilde{f}(x)$ defined on $\mathbb{S}^n$, i.e. \begin{eqnarray*} \widetilde{H}_{k}(G^{-1}(x))=\tilde{f}(x). \end{eqnarray*} We can prove the existence of solution to this problem if the given function $\t…
Starshaped compact hypersurfaces with prescribed m-th mean curvature in hyperbolic space
研究了双曲空间中具有给定m阶中曲率的星形紧致超曲面的存在性。
In this paper, we study the Dirichlet problem for $p$-convex hypersurfaces with prescribed curvature. We prove that there exists a graphic hypersurface satisfying the prescribed curvature equation with homogeneous boundary condition. An interior curvature estimate is also obtained.
In this paper, we establish the curvature estimates for $p$-convex hypersurfaces in $\mathbb{R}^{n+1}$ of prescribed curvature with $p\geq \frac{n}{2}$. The existence of a star-shaped hypersurface of prescribed curvature is obtained. We also prove a type of interior $C^2$ estimates for solutions to the Dirichlet problem of the corresponding equation.
Hypersurfaces of Prescribed Gauss Curvature in Exterior Domains
证明了欧几里得空间中紧集的补空间中具有给定高斯曲率的凸超曲面的一个存在性定理。
We are concerned with spacelike convex hypersurfaces of positive constant (K-hypersurfaces) or prescribed Gauss curvature in Minkowski space. Our main purpose is to study entire solutions as well as the Dirichlet problem in bounded domains of the related Monge-Ampere equation.
Entire spacelike hypersurfaces of prescribed scalar curvature in Minkowski space
证明了Minkowski空间中具有给定负数量曲率，且在无穷远处给定值停留在光锥有界距离处的整类空超曲面的存在唯一性.
Deforming a hypersurface by principal radii of curvature and support function
本文研究由主曲率半径与支撑函数驱动的超曲面膨胀流，在特定条件下证明其规范化流 $C^{\infty}$ 收敛于同位自相似解，无需常秩定理，并给出失去光滑性的反例。
In the previous paper, it has been proved that the generalized rotational hypersurfaces of O(n-1)-type and O (l+1) x O(m+1)-type, for which the mean curvature is any prescribed continuous function. This paper is a sequel, and a similar existence result is shown for any type.
The constant mean curvature hypersurfaces with prescribed gradient image
该文研究具指定梯度像的常平均曲率超曲面的存在性，在ℝⁿ中一致凸有界光滑域的条件下，证明常平均曲率方程第二边值问题存在唯一凸解。
$k$-convex hypersurfaces with prescribed Weingarten curvature in warped product manifolds
针对 warped product 流形中 $n<2k$ 的 $k$-凸超曲面，本文基于 Ren-Wang 猜想直接证明 Weingarten 曲率方程的曲率估计，并利用度理论建立星形紧致解的存在性。
The purpose of this paper is to investigate the Cahn-Hillard approximation for entire minimal hypersurfaces in the hyperbolic space. Combining comparison principles with minimization and blow-up arguments, we prove existence results for entire local minimizers with prescribed behaviour at infinity. Then, we study the limit as the length scale tends to zero through a $Γ$-convergence analysis, obtaining existence of entire minimal hypersurfaces with prescribed boundary at infinity. In particular, we recover some existence results proved in M. Anderson and U. Lang using geometric measure theory.
In [7], Guan, Ren and Wang obtained a $C^2$ a priori estimate for admissible 2-convex hypersurfaces satisfying the Weingarten curvature equation $σ_2(κ(X))=f(X, ν(X)).$ In this note, we give a simpler proof of this result, and extend it to space forms.
This paper is devoted to $C^2$ a priori estimates for strictly locally convex radial graphs with prescribed Weingarten curvature and boundary in space forms. By constructing two-step continuity process and applying degree theory arguments, existence results in space forms are established for prescribed Gauss curvature equation under the assumption of a strictly locally convex subsolution.
Convex capillary hypersurfaces of prescribed curvature problem
本文将闭凸超曲面的规定$k$-阶Weingarten曲率问题扩展到毛细情形，通过将其转化为球冠上带Robin边界条件的Hessian商方程可解性问题，在自然充分条件下证明了严格凸毛细超曲面的存在性，扩展了毛细Minkowski问题的相关研究。
In this paper, we consider prescribed shifted Gauss curvature equations for horo-convex hypersurfaces in $\mathbb{H}^{n+1}$. Under some sufficient condition, we obtain an existence result by the standard degree theory based on the a prior estimates for the solutions to the equations. Different from the prescribed Weingarten curvature problem in space forms, we do not impose a sign condition for radial derivative of the functions in the right-hand side of the equations to prove the existence due to the horo-covexity of hypersurfaces in $\mathbb{H}^{n+1}$.
We consider the corresponding Christoffel-Minkowski problem for curvature measures. The existence of star-shaped $(n-k)$-convex bodies with prescribed $k$-th curvature measures ($k>0$) has been a longstanding problem. This is settled in this paper through the establishment of a crucial $C^2$ a priori estimate for the corresponding curvature equation on $\mathbb S^n$.
In this paper we consider the prescribed mean curvature flow of a non-compact space-like Cauchy hypersurface of bounded geometry in a generalized Robertson-Walker space-time. We prove that the flow preserves the space-likeness condition and exists for infinite time. We also prove convergence in the setting of manifolds with boundary. Our discussion generalizes previous work by Ecker, Huisken, Gerhardt and others with respect to a crucial aspects: we consider any non-compact Cauchy hypersurface under the assumption of bounded geometry. Moreover, we specialize the aforementioned works by conside…
In this paper, we investigate the existence and uniqueness of convex, entire, spacelike hypersurfaces of constant $σ_k$ curvature with prescribed set of lightlike directions $\mathcal{F}\subset\mathbb{S}^{n-1}$ and perturbation $q$ on $\mathcal{F}$. We prove that given a closed set $\mathcal{F}$ in the ideal boundary at infinity of hyperbolic space and a perturbation $q$ that satisfies some mild conditions, there exists a complete entire spacelike constant $σ_k$ curvature hypersurface $\mathcal{M}_u$ with prescribed set of lightlike directions $\mathcal{F}$ satisfying when $\frac{x}{|x|}\in\ma…
Hypersurfaces of constant higher order mean curvature in hyperbolic space with prescribed asymptotic boundary at infinity
本文针对双曲空间中具有指定无穷远渐近边界的常高阶平均曲率超曲面，通过新论证将证明简化至半凸情形，证明了其存在性，结果适用于次临界范围内大部分指标。
Prescribed mean curvature hypersurfaces in conformal product manifolds
本文在 conformal product manifolds 中研究 prescribed mean curvature 超曲面的存在性，扩展了 Gerhardt 的工作，并获得高维 PMC Plateau 问题的新解。
An eigenvalue problem for prescribed curvature equations
本文研究星形k-凸闭超曲面的预定σ_k-曲率方程特征值问题，在偶数据条件下证明了唯一特征值及唯一相关超曲面的存在性，并证明该超曲面严格凸，关键方法是对L_p型方程建立关于p的一致估计。
The Dirichlet problem for the prescribed curvature equations in Minkowski space
针对Minkowski空间中预定曲率类空超曲面，本文研究其Dirichlet问题，并为对应完全非线性椭圆PDE的容许解建立新的内部二阶估计。
A level-set method for a mean curvature flow with a prescribed boundary
本文提出一种通过将边界解释为障碍的水平集方法，求解具有预定边界的平均曲率流，实现了时间全局解且无初始超曲面限制，并证明其与经典及Sternberg-Ziemer构建的Dirichlet条件解一致。
The gluing technique is used to construct hypersurfaces in Euclidean space having approximately constant prescribed mean curvature. These surfaces are perturbations of unions of finitely many spheres of the same radius assembled end-to-end along a line segment. The condition on the existence of these hypersurfaces is the vanishing of the sum of certain integral moments of the spheres with respect the prescribed mean curvature function.
Let $ψ$ be a given function defined on a Riemannian space. Under what conditions does there exist a compact starshaped hypersurface $M$ for which $ψ$, when evaluated on $M$, coincides with the $m-$th elementary symmetric function of principal curvatures of $M$ for a given $m$? The corresponding existence and uniqueness problems in Euclidean space have been investigated by several authors in the mid 1980's. Recently, conditions for existence were established in elliptic space and, most recently, for hyperbolic space. However, the uniqueness problem has remained open. In this paper we investigat…
In this paper, we prove the existence of smooth, entire, strictly convex, spacelike, constant $σ_k$ curvature hypersurfaces with prescribed lightlike directions in Minkowski space. This is equivalent to prove the existence of smooth, entire, strictly convex, spacelike, constant $σ_k$ curvature hypersurfaces with prescribed Gauss map image. We also show that there doesn't exist any entire, convex, strictly spacelike, constant $σ_k$ curvature hypersurfaces. Moreover, we generalize the result in \cite{RWX} and construct strictly convex, spacelike, constant $σ_k$ curvature hypersurface with bounde…
In this paper, we consider the Dirichlet problem for a class of prescribed curvature equations. Both degenerate and non-degenerate cases are considered. The existence of the $C^{1,1}$ regular graphic hypersurfaces with prescribing a class of curvatures and constant boundary is proved for the degenerate case.
We show that for a very general and natural class of curvature functions, the problem of finding a complete strictly convex hypersurface satisfying f(κ) = σ over (0,1) with a prescribed asymptotic boundary Γ at infinity has at least one solution which is a "vertical graph" over the interior (or the exterior) of Γ. There is uniqueness for a certain subclass of these curvature functions and as σ varies between 0 and 1, these hypersurfaces foliate the two components of the complement of the hyperbolic convex hull of Γ.
We consider the evolution of starshaped hypersurfaces in the Euclidean space by general curvature functions. Under appropriate conditions on the curvature function, we prove the global existence and convergence of the flow to a hypersurface of prescribed curvature.
We prove existence and stability of smooth entire strictly convex spacelike hypersurfaces of prescribed Gauss curvature in Minkowski space. The proof is based on barrier constructions and local a priori estimates.
Quantitative Estimates on the Topology and Singular Set of Prescribed Mean Curvature Hypersurfaces
本文研究了给定平均曲率超曲面的拓扑和奇点性质，建立了面积和曲率约束下的定量估计，扩展了极小超曲面的相关研究。
We define a new version of modified mean curvature flow (MMCF) in hyperbolic space $\mathbb{H}^{n+1}$, which interestingly turns out to be the natural negative $L^2$-gradient flow of the energy functional defined by De Silva and Spruck in \cite{DS09}. We show the existence, uniqueness and convergence of the MMCF of complete embedded star-shaped hypersurfaces with fixed prescribed asymptotic boundary at infinity. As an application, we recover the existence and uniqueness of smooth complete hypersurfaces of constant mean curvature in hyperbolic space with prescribed asymptotic boundary at infini…
Smooth approximations for constant-mean-curvature hypersurfaces with isolated singularities
本文针对具有孤立奇点的常平均曲率超曲面，证明了在切锥正则且超曲面为最小化Caccioppoli集边界时，存在一列同平均曲率的光滑超曲面收敛到它，并指出维数8时锥条件可省略。
The prescribed curvature problem for entire hypersurfaces in Minkowski space
本文证明了Minkowski空间中完备类空超曲面在预定曲率方程及向下平移解下的存在性、唯一性与有界性，涵盖严格凸与$k$-凸情形。
In this paper, we prove the existence of hypersurfaces in the Euclidean space with prescribed boundary and whose k-th Weingarten curvature equals a given function that depends on the normal of the hypersurface. The proof is based on the solvability of a fully nonlinear elliptic PDE. The required a priori estimates are established under the natural assumptions that the prescribed boundary is strictly convex and the prescribed function satisfies a Serrin type condition.
Entire spacelike radial graphs with prescribed mean curvature in the Lorentz--Minkowski space
研究洛伦兹-闵氏空间中具有给定平均曲率的整个空间样超曲面的存在性和唯一性，探讨其关于一点星形且渐近于光锥的性质，并推导Willmore型不等式，证明在平均曲率属于L^p时的非存在性结果。
We prove existence in the Minkowski space of entire spacelike hypersurfaces with constant negative scalar curvature and given set of lightlike directions at infinity; we also construct the entire scalar curvature flow with prescribed set of lightlike directions at infinity, and prove that the flow converges to a spacelike hypersurface with constant scalar curvature. The proofs rely on barriers construction and a priori estimates.
In this paper, we study the exterior problem for the maximal surface equation. We obtain the precise asymptotic behavior of the exterior solution at infinity. And we prove that the exterior Dirichlet problem is uniquely solvable given admissible boundary data and prescribed asymptotic behavior at infinity.
Fully nonlinear equations on Riemannian manifolds with negative curvature
我们考虑在负曲率的情况下，将一个度量共形变形为一个具有Ricci张量特征值的预定对称函数的度量的问题。
Global Curvature Estimates for k-Convex Hypersurfaces
针对预定曲率方程的k-凸解，提出结合分式线性变换与双曲多项式对数凹性的新方法，通过强制性二次型估计，在3≤k<n<2k范围内建立了闭严格星形k-凸超曲面的全局曲率界。
We prove that for any given compact Riemannian manifold $N$ of dimension $n+1 \geq 3$ and any non-negative Lipschitz function $g$ on $N$, there exists a quasi-embedded, boundaryless hypersurface $M \subset N,$ of class $C^{2, α}$ for any $α\in (0,1),$ such that $M$ is the image of a two-sided immersion whose mean curvature is given by $gν$ for an appropriate choice of continuous unit normal $ν$ to the immersion; and moreover, the singular set $Σ= \overline{M} \setminus M$ is empty if $2 \leq n \leq 6,$ finite if $n=7$ and satisfies ${\mathcal H}^{n-7 + γ}(Σ) = 0$ for every $γ>0$ if $n \geq 8$.…
We consider, in a first instance, the class of boundaries of sets with locally finite perimeter whose (weakly defined) mean curvature is $g ν$, for a given continuous positive ambient function $g$, and where $ν$ denotes the inner normal. It is well-known that taking limits in the sense of varifolds within this class is not possible in general, due to the appearence of "hidden boundaries", that is, portions (of positive measure with even multiplicity) on which the (weakly defined) mean curvature vanishes, so that $g$ does not prescribe the mean curvature in the limit. As a special instance of a…
In this paper we study the problem of conformally deforming a metric to a prescribed symmetric function of the eigenvalues of the Schouten tensor on compact Riemannian manifolds with boundary. We prove its solvability and the compactness of the solution set, provided the Ricci tensor is non-negative definite.
We obtain $C^2$ a priori estimates for solutions of the nonlinear second-order elliptic equation related to the geometric problem of finding a strictly locally convex hypersurface with prescribed curvature and boundary in a space form. Under the assumption of a strictly locally convex subsolution, we establish existence results by using degree theory arguments.
Curvature estimates for hypersurfaces of constant curvature in hyperbolic space II
本文研究双曲空间中具有常(n-2)曲率和指定无穷远处渐近边界的光滑完备超曲面的存在性，通过推导曲率估计，扩展了曲率值的范围。
Allen--Cahn and mean curvature flows from Clifford hypersurfaces to equators
该研究借助OpenAI对Solomon--Yau猜想的解决，将与Pedro Gaspar的合作成果推广至n≥2的所有维度，在S^{n+1}上构造了连接Clifford超曲面近似值与赤道球面的永恒Allen--Cahn流及无穷多永恒积分Brakke流。
Mean curvature flows with prescribed singular sets
研究构造了在R^{m+n}中相对于近欧几里得度量的光滑度量的均凸古老解，其首次奇点集恰好为K×{0}。
Given a compact Riemannian manifold $M$, we consider a warped product $\bar M = I \times_h M$ where $I$ is an open interval in $\Rr$. We suppose that the mean curvature of the fibers do not change sign. Given a positive differentiable function $ψ$ in $\bar M$, we find a closed hypersurface $Σ$ which is solution of an equation of the form $F(B)=ψ$, where $B$ is the second fundamental form of $Σ$ and $F$ is a function satisfying certain structural properties. As examples, we may exhibit examples of hypersurfaces with prescribed higher order mean curvature.
Asymptotic Plateau problem for $3$-convex hypersurface in $\mathbb{H}^5$
本文研究了5维双曲空间中$3$-凸超曲面的渐近平台问题，通过拉格朗日乘数法证明了满足特定曲率方程和渐近边界的超曲面存在性。
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。
For a congruence of straight lines defined by a hypersurface in $R^{n+1}, n \geq 1,$ and a field of reflected directions created by a point source we define the notion of intensity in a tangent direction and introduce elementary symmetric functions $S_m, m=1, 2,...,n,$ of {\it principal intensities}. The problem of existence and uniqueness of a closed hypersurface with prescribed $S_n$ is the "reflector problem" extensively studied in recent years. In this paper we formulate and give sufficient conditions for solvability of an analogous problem in which the mean intensity $S_1$ is a given func…
Inspired by [6, 7], we study the boundary regularity of constant curvature hypersurfaces in the hyperbolic space $\mathbb{H}^{n+1}$, which have prescribed asymptotic boundary at infinity. Through constructing the boundary expansions of the solutions, we derive the optimal regularity of the solutions. Moreover, we obtain an equivalent condition that guarantees the smoothness of the solutions.
In this paper we are concerned with the problem of finding hypersurfaces of constant curvature and prescribed boundary in the Euclidean space, using the theory of fully nonlinear elliptic equations. We prove that if the given data admits a suitable radial graph as a subsolution, then we can find a radial graph with constant curvature and that realizes the prescribed boundary. As an application we prove that if $Ω\subset\mathbb{S}^n$ is a mean convex domain whose closure is contained in an open hemisphere of $\mathbb{S}^n$ then, for $0<R<n(n-1),$ there exists a radial graph of constant scalar c…
Existence and uniqueness in ${\Bbb R}^{n,1}$ of entire spacelike hypersurfaces contained in the future of the origin $O$ and asymptotic to the light-cone, with scalar curvature prescribed at their generic point $M$ as a negative function of the unit vector $\overrightarrow{Om}$ pointing in the direction of $\overrightarrow{OM}$, divided by the square of the norm of $\overrightarrow{OM}$ (a dilation invariant problem). The solutions are seeked as graphs over the future unit-hyperboloid emanating from $O$ (the hyperbolic space); radial upper and lower solutions are constructed which, relying on …
The horospherical $p$-Christoffel-Minkowski and prescribed $p$-shifted Weingarten curvature problems in hyperbolic space
本文研究双曲空间中凸超曲面的对应几何问题，通过建立新满秩定理证明极限球面p-Christoffel-Minkowski问题存在光滑原点对称严格凸解，并提出给定p-偏移Weingarten曲率问题且证明其存在性结果。
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