We consider compact convex hypersurfaces contracting by functions of their curvature. Under the mean curvature flow, uniformly convex smooth initial hypersurfaces evolve to remain smooth and uniformly convex, and contract to points after finite time. The same holds if the initial data is only weakly convex or non-smoot…
Study on anisotropic curvature flow for noncompact convex hypersurfaces.
problem Anisotropic curvature flow of noncompact convex hypersurfaces.
method Flow of complete noncompact convex hypersurfaces with anisotropy determined by a Wulff shape.
result The flow exists for all positive time for initial conditions.
The paper studies a flow of convex hypersurfaces expanding by their support and curvature functions.
problem Analyzing the behavior of expanding hypersurfaces in Euclidean space.
method Introduced a curvature flow with specific speed function and proved the existence and convergence of the flow under certain conditions.
result The flow converges to a round sphere centered at the origin for all time under specific conditions.
Flow of convex hypersurfaces in hyperbolic space converges to geodesic spheres.
problem Understanding the evolution of convex hypersurfaces in hyperbolic space.
method Gauss curvature type flow, Alexandrov-Fenchel inequality application.
result Smooth solution converges to geodesic spheres.
The paper extends a Harnack inequality to noncompact evolving hypersurfaces.
problem Proving a Harnack inequality for noncompact evolving hypersurfaces.
method Using a differential Harnack inequality for noncompact convex hypersurfaces flowing with normal speed based on their principal curvatures.
result The extension of Andrews' result to noncompact hypersurfaces.
The paper studies curvature flows in hyperbolic space and proves convergence to spheres under certain conditions.
problem Curvature flows in hyperbolic space and their convergence properties.
method Analyzes a class of flows with specific speed functions and proves convergence under various conditions.
result The mean convex and uniformly convex solutions to the flow converge to spheres for specified conditions.
Anisotropic expanding flow of convex hypersurfaces converges to a soliton under certain conditions.
problem Anisotropic expanding curvature flows of convex hypersurfaces in Euclidean space.
method Proving the existence and convergence of a unique smooth and uniformly convex solution to the flow under specific conditions.
result The flow converges to a soliton which solves an elliptic equation when parameters are within a suitable range.
We prove ε-closeness of hypersurfaces to a sphere in Euclidean space under the assumption that the traceless second fundamental form is δ-small compared to the mean curvature. We give the explicit dependence of δ on ε within the class of uniformly convex hypersurfaces with bounded volume.
Paper finds unique solutions for curved surfaces with specific gradient.
problem Existence of curved surfaces with specific gradient.
method Second boundary value problem of constant mean curvature equations.
result Unique convex solutions for constant mean curvature equations.
New control on diameter and curvature for evolving surfaces.
problem Controlling the diameter and curvature of evolving surfaces under mean curvature flow.
method Detailed analysis of cylindrical regions under mean curvature flow.
result Intrinsic diameter stays uniformly controlled as surfaces approach first singular time.
Unified flow solves Lp Christoffel-Minkowski problem for p>1.
problem Solving the Lp Christoffel-Minkowski problem for p>1. method Anisotropic expanding flow of smooth hypersurfaces with speed ψσk(λ)α. result The flow converges to a solution of the Lp Christoffel-Minkowski problem. The paper proves a unique solution to a shrinking flow equation converging to a soliton.
problem Existence and uniqueness of solutions to a specific shrinking flow equation.
method Anisotropic shrinking flow with speed based on support function and curvature radii.
result Smooth convergence to a soliton for certain parameter ranges.
We prove that convex hypersurfaces in Rn+1 contracting under the flow by any power α>n+21 of the Gauss curvature converge (after rescaling to fixed volume) to a limit which is a smooth, uniformly convex self-similar contracting solution of the flow. Under additional central symmetry of the ini…
The paper introduces a new flow to converge to a Wulff shape from a smooth convex hypersurface.
problem Proving Alexandrov-Fenchel inequalities for anisotropic mixed volumes.
method Introducing a fully nonlinear locally constrained anisotropic curvature flow.
result The flow converges smoothly and exponentially to a scaled Wulff shape.
This paper solves the Christoffel problem in hyperbolic space and its equivalent on spheres.
problem Prescribing curvatures for convex hypersurfaces in hyperbolic space.
method Proving a full rank theorem to establish the existence of solutions.
result Existence of solutions to the Christoffel problem and its equivalent Nirenberg-Kazdan-Warner problem on spheres.
Constructs uniformly positive scalar curvature metrics on open manifolds
problem Finding uniformly positive scalar curvature metrics on open manifolds
method Using Morse functions and exhaustion
result Proving the existence of uniformly positive scalar curvature metrics
The paper studies curvature flows of star-shaped hypersurfaces and proves convergence to spheres.
problem Analyzing the convergence of a class of anisotropic curvature flows.
method Using new auxiliary functions, the paper studies a class of flows with specific speed and proves convergence under certain conditions.
result The k-convex solution to the flow converges smoothly to a sphere after normalization for specific values of k, α, and β. Study shows linear growth of index for free boundary minimal hypersurfaces.
problem Understanding the index growth of free boundary minimal hypersurfaces.
method Analyzes the Morse index growth in relation to homology groups and boundary components.
result Linear growth of index with dimension of first relative homology group and number of boundary components.
The paper studies foliation flows with logarithmic speeds and finds convergence to translating solutions.
problem Flowing foliations with specific curvature speeds and analyzing convergence behavior.
method Analyzes foliations of Rn+1∖{0} with speeds −log(F/f), focusing on uniformly convex hypersurfaces. result There is a distinct leaf MΘ∗ such that flows starting from it converge to a translating solution. The study shows that close hypersurfaces have uniformly bounded inequalities.
problem Bounding inequalities for close hypersurfaces.
method Analyzing families of smooth hypersurfaces close to a fixed one.
result Uniformly bounded constants in Sobolev, Gagliardo-Nirenberg, and geometric Calderón-Zygmund inequalities.
Classifies ancient solutions to curvature flows, finding two main types.
problem Classifying ancient solutions to fully nonlinear curvature flows.
method Natural conditions on speed, convexity, noncollapsing, uniform two-convexity.
result Exactly two possibilities: self-similarly shrinking cylinder or rotationally symmetric translating soliton.
Compactness of singular minimal hypersurfaces with bounded volumes and eigenvalues.
problem Proving compactness of singular minimal hypersurfaces with specific bounded conditions.
method Using a combination of geometric and spectral analysis on Riemannian manifolds.
result Generalization of compactness results to higher dimensions.
The study calculates the average number of tangent k-dimensional subspaces to multiple convex hypersurfaces in random position.
problem Determining the average number of k-dimensional subspaces tangent to multiple convex hypersurfaces in random position.
method Investigates the problem from a random point of view, using the Orthogonal group to translate hypersurfaces and calculating the average number of k-flats tangent to all hypersurfaces.
result The average number of k-flats tangent to d_{k,n} many random (n-k-1)-flats is given by a formula involving volumes and curvature integrals.
Study of Brown--York mass for four-dimensional asymptotically flat manifolds.
problem Calculating mass for hypersurfaces in four-dimensional asymptotically flat manifolds.
method Intrinsic definition of mean curvature, expansion analysis for large uniformly convex hypersurfaces.
result Shape-dependent correction to ADM mass for nearly round surfaces vanishes under certain conditions.
The paper studies hypersurfaces in spheres using mean curvature flow with surgery.
problem Studying hypersurfaces in spheres under specific curvature pinching conditions.
method Using mean curvature flow with surgery to preserve and analyze curvature pinching conditions.
result Hypersurfaces satisfying the pinching condition are diffeomorphic to spheres or connected sums of spheres.
Derives a simpler equation for CR-curvature vanishing on certain complex hypersurfaces.
problem Deriving a simpler equation for CR-curvature vanishing on certain complex hypersurfaces.
method Utilizes two invariants discovered by S. Pocchiola to provide an alternative derivation of the CR-curvature vanishing condition.
result Provides an alternative derivation of the CR-curvature vanishing condition equivalent to the Monge equation.
We show that for a very general class of curvature functions defined in the positive cone, the problem of finding a complete strictly locally convex hypersurface in Hn+1 satisfying f(κ)=σ∈(0,1) with a prescribed asymptotic boundary Γ at infinity has at least one smooth solution with uniformly bounded hyperbol…
Proves convexity of certain hypersurfaces with negative λ.
problem Understanding convexity of hypersurfaces with specific λ values.
method Analyzes mean convex hypersurfaces and proves convexity for λ ≤ 0.
result Closed n-dimensional mean convex λ-hypersurfaces are convex if λ≤0. Flow of spacelike hypersurfaces converges to flat slice in asymptotically flat spacetimes.
problem Long-time behavior of mean curvature flow in asymptotically flat spacetimes.
method Analysis of mean curvature flow in Lorentzian product manifolds.
result Mean curvature flow converges uniformly to a flat slice as time goes to infinity.
New global section found for geodesic flows on convex hypersurfaces.
problem Finding global sections for geodesic flows on convex hypersurfaces.
method Constructing a global hypersurface of section with an isometric involution.
result Generalized Birkhoff annulus to higher dimensions.
The study proves the existence of k-convex hypersurfaces for specific curvature equations.
problem Proving the existence of k-convex hypersurfaces for Hessian curvature equations. method Combining a priori estimates with the continuity method, and establishing a constant rank theorem.
result Existence and uniqueness of k-convex hypersurfaces for both nonhomogeneous and homogeneous Hessian curvature equations. Local rigidity proved for convex hypersurfaces in spaces of constant curvature.
problem Proving rigidity of convex hypersurfaces in spaces of constant curvature.
method Analyzing isometric convex hypersurfaces in spaces of constant curvature of dimension n≥4. result Two convex isometric hypersurfaces are congruent locally around their corresponding under strict convexity isometries.
Groups with specific subgroup actions have proper actions on uniformly convex spaces.
problem Proper actions of hyperbolic relative groups on Banach spaces.
method Affine isometric actions on uniformly convex Banach spaces.
result Groups with proper actions on uniformly convex spaces.
New compact mean convex hypersurfaces found for positive λ.
problem Finding compact embedded hypersurfaces for positive λ.
method Constructing compact mean convex hypersurfaces diffeomorphic to spheres.
result No compact convex embedded λ-hypersurfaces except a round sphere for λ > 0.
Paper solves Dirichlet problem for p-convex hypersurfaces with curvature constraints.
problem Solving the Dirichlet problem for p-convex hypersurfaces with prescribed curvature. method Proved existence of a graphic hypersurface satisfying the prescribed curvature equation with homogeneous boundary condition, obtained an interior curvature estimate.
result Existence of a graphic hypersurface satisfying the prescribed curvature equation with homogeneous boundary condition.
Compactness proven for manifolds with nonnegative Ricci curvature and uniformly convex boundary.
problem Compactness of manifolds with specific curvature and boundary conditions.
method Monotone quantities constructed from positive proper harmonic functions with Neumann condition.
result Proves compactness of manifolds with nonnegative Ricci curvature and uniformly convex boundary.
Lower bounds for surface area and volume of convex hypersurfaces.
problem Establishing bounds for surface area and volume of convex hypersurfaces.
method Using displacement under continuous maps to establish lower bounds.
result Proves a lower bound for the volume of a Riemannian n-sphere in all dimensions.
The study finds large Betti numbers in minimal hypersurfaces with positive Ricci curvature.
problem Minimal hypersurfaces with large Betti numbers in manifolds with positive Ricci curvature.
method Constructing sequences of manifolds with embedded minimal hypersurfaces.
result Minimal hypersurfaces have unbounded first Betti numbers.
Analyzes singularities of convex hypersurfaces in hyperbolic space.
problem Understanding singularities of convex hypersurfaces with constant curvature.
method Analyzes the structure of singular sets using convex curvature functions.
result Describes the structure of singular sets in hyperbolic space.
The paper studies critical sections of the Allen-Cahn functional and their relation to minimal hypersurfaces.
problem Minimal hypersurfaces with boundary equal to a given submanifold.
method Analysis of the Allen-Cahn functional and its critical sections.
result The limit of critical sections converges to a stationary varifold, which is a minimal hypersurface away from the boundary.
Paper establishes an optimal inequality for convex hypersurfaces.
problem Optimal inequality for locally strongly convex centroaffine hypersurfaces.
method Used covariant derivatives of difference tensor and Tchebychev vector field.
result Complete classification of hypersurfaces realizing equality in inequality.
We prove a structural theorem that provides a precise local picture of how a sequence of closed embedded minimal hypersurfaces with uniformly bounded index (and volume if the ambient dimension is greater than three) in a Riemannian manifold of dimension at most seven, can degenerate. Loosely speaking, our results show …
Sharp bounds on mean curvature and geodesic lengths in convex hypersurfaces.
problem Finding sharp bounds on total mean curvature of convex hypersurfaces.
method Sharp lower bounds for mean width and Birkhoff invariant, characterizing spheres.
result Generalization of Álvarez Paiva's result to convex hypersurfaces.
The study extends Huisken's theorem to nonconvex surfaces that shrink to round points.
problem Extending Huisken's theorem to nonconvex surfaces.
method Constructing mean convex and non-mean convex hypersurfaces, using mean curvature flow.
result Found pathological examples of flows and sequences of flows that shrink to round points.
2-convex translating solitons are locally strictly convex.
problem Characterizing the convexity of translating solitons in mean curvature flow.
method Analyzing uniformly 2-convex translating solitons in Rn+1. result Locally strictly convex translating solitons are axisymmetric.
Paper proves rigidity of convex hypersurfaces in various spaces.
problem Proving the uniqueness of convex hypersurfaces in multidimensional spaces.
method Generalizing Senkin's theorem to higher dimensions and constant curvature spaces.
result Rigidity of convex hypersurfaces in En+1, n≥3. In this paper, we consider minimal hypersurfaces in the product space Hn×R. We begin by studying examples of rotation hypersurfaces and hypersurfaces invariant under hyperbolic translations. We then consider minimal hypersurfaces with finite total curvature. This assumption implies that the …
Optimal inequality for free boundary hypersurfaces in convex domains.
problem Proving an optimal Heintze-Karcher inequality for free boundary hypersurfaces.
method Analyzing anisotropic free boundary hypersurfaces in convex domains.
result Optimal Heintze-Karcher-type inequality achieved for anisotropic free boundary Wulff shapes.