Marc Herzlich
We prove in a simple and coordinate-free way the equivalence bteween the classical definitions of the mass or the center of mass of an asymptotically flat manifold and their alternative definitions depending on the Ricci tensor and conformal Killing fields. This enables us to prove an analogous statement in the asymptotically hyperbolic case.
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In this paper, we will recover Hamilton's Harnack inequality for the Ricci flow from the view point of Hyperbolic thermostat.
In this article we study the short-time existence of conformal Ricci flow on asymptotically hyperbolic manifolds. We also prove a local Shi's type curvature derivative estimate for conformal Ricci flow.
In this paper, the author has considered the hyperbolic Kahler-Ricci flow introduced by Kong and Liu [11], that is, the hyperbolic version of the famous Kahler-Ricci flow. The author has explained the derivation of the equation and calculated the evolutions of various quantities associated to the equation including the curvatures. Particularly on Calabi-Yau manifolds, the equation can be simplified to a scalar hyperbolic Monge-Ampere equation which is just the hyperbolic version of the corresponding one in Kahler-Ricci flow.
A Lie hypersurface in the complex hyperbolic space is an orbit of a cohomogeneity one action without singular orbit. In this paper, we classify Ricci soliton Lie hypersurfaces in the complex hyperbolic spaces.
We show that at the level of formal expansions, any compact Riemannian manifold is the sphere at infinity of an asymptotically conical gradient expanding Ricci soliton.
Ricci Curvature Rigidity for Weakly Asymptotically Hyperbolic Manifolds
在不假定流形是自旋的情况下，证明了具有里奇曲率下界的弱渐近双曲流形的一个刚性结果.该论点利用准局部质量表征的欧几里得球从\cite{Miao} \cite{S_T}和本征函数紧化的想法从\cite{Qing}。
On trivial gradient hyperbolic Ricci and gradient hyperbolic Yamabe solitons
该研究给出紧梯度双曲Ricci与Yamabe孤立子为平凡的判定条件，证明维数大于2的紧梯度双曲Yamabe孤立子满足度量第二李导数无迹无散时为常数量曲率流形，丰富了几何孤立子的平凡性判据。
In this paper, we study the topology of complete noncompact Riemannian manifolds with asymptotically nonnegative Ricci curvature and large volume growth. We prove that they have finite topological types under some curvature decay and volume growth conditions. We also generize it to the manifolds with $k$-th asymptotically nonnegative Ricci curvature by using extensions of Abresch-Gromoll's excess function estimate.
Hyperbolic solitons on trans-Sasakian space forms and its submanifolds
引入双曲$*-$Ricci孤子和双曲Ricci-Yamabe孤子概念，研究跨Sasakian空间形式及其子流形上孤子的性质。
For an asymptotically Poincare-Einstein manifold with a lower Ricci curvature bound, we establish a sharp inequality relating the type II Yamabe invariant of the interior and the Yamabe invariant of its conformal infinity
Ricci solitons as submanifolds of complex hyperbolic spaces
本文针对对称空间为复双曲空间的情况，对具有Ricci孤立子诱导度量的、非紧型对称空间Iwasawa分解可解部分的李子群开展分类与几何性质分析。
In this paper we prove that any asymptotically cylindrical gradient shrinking Ricci soliton is isometric to a cylinder.
Ricci-flat deformations of asymptotically cylindrical Calabi--Yau manifolds
研究了一类产生于拟投射流形上的渐近圆柱Ricci平坦Kähler度量.利用Calabi-Yau几何和分析以及Kodaira-Kuranishi-Spencer理论，并在N.Koiso关于紧流形的结果的基础上，我们证明了在相当一般的假设下，渐近柱面Ricci平坦Kähler度量的任何“小”渐近柱面Ricci平坦变形都是Kähler的，可能是关于扰动的复结构的。我们还发现这些小的变形的模空间的尺寸。在$2n$ -流形上的渐近圆柱Ricci平坦度量类中，完整约化为SU（n）是一个开条件.
In general relativity, there have been a number of successful constructions for asymptotically flat metrics with a certain background foliation. In particular, C. -Y. Lin used a foliation by the Ricci flow on 2-spheres to establish an asymptotically flat extension and C. Sormani and Lin proved useful results with this extension. In this paper, we construct asymptotically hyperbolic 3-metrics with the Ricci flow foliation. We also study the rigid case when the Hawking mass of the inner surface of the manifold agrees with its total mass.
In a previous paper, we constructed complete manifolds of positive Ricci curvature with quadratically asymptotically nonnegative curvature and infinite topological type but dimension $\ge 6$. The purpose of the present paper is to use a different way to exhibit a family of complete $I$-dimensinal ($I\ge5$) Riemannian manifolds of positive Ricci curvature, quadratically asymptotically nonnegative sectional curvature, and certain infinite Betti number $b_j$ ($2\le j\le I-2$).
Sobolev Inequality on Manifolds With Asymptotically Nonnegative Bakry-Émery Ricci Curvature
本文受已有工作启发，在具有密度且Bakry-Émery Ricci曲率渐近非负的流形上证明了Sobolev不等式。
In this paper, we prove that if an asymptotically Euclidean manifold $(M^n,g)$ under the condition that $R \ge 0$ has long time existence of Ricci flow, the mass of $(M^n,g)$ is nonnegative. In addition, we give an independent proof of positive mass theorem in dimension $3$.
Based on properties of n-subharmonic functions we show that a complete, noncompact, properly embedded hypersurface with nonnegative Ricci curvature in hyperbolic space has an asymptotic boundary at infinity of at most two points. Moreover, the presence of two points in the asymptotic boundary is a rigidity condition that forces the hypersurface to be an equidistant hypersurface about a geodesic line in hyperbolic space. This gives an affirmative answer to the question raised by Alexander and Currier in 1990.
Topology of Manifolds with Asymptotically Nonnegative Ricci Curvature
本文研究了具有渐近非负里奇曲率的完备非紧黎曼流形的拓扑。证明了具有渐近非负里奇曲率且截面曲率至多二次衰减的完备非紧流形在一定条件下与欧氏n-空间R^n是同构的，条件是从基点p出发的射线的密度或M中测地球的体积增长.
Mass of $C^0$-asymptotically hyperbolic spaces via the normalized Ricci-DeTurck flow
研究通过归一化 Ricci-DeTurck 流在渐近双曲流形上定义质量函数，此定义与光滑度量经典质量相符，还引入标量曲率下界以确保连续质量定义明确。
Stability of asymptotically conical gradient Kähler-Ricci expanders
本文证明渐近锥形梯度Kähler-Ricci扩张子在适当扰动下，规范化Kähler-Ricci流全局存在并收敛到同类的孤子度量，且若扰动在无穷远处渐近于原度量，则极限度量与原度量相同。
We prove an existence theorem for Asymptotically Conical Ricci Flat Kahler metrics in $\mathbb{C}^2$ with cone singularities along a smooth complex curve. These metrics are expected to arise as blow up limits of non collapsed sequences of Kahler Einstein metrics with cone singularities.
We construct an expanding gradient Ricci soliton in dimension three over the topological manifold R x T^2 (the product of a line and a torus) that aproaches asymptotically a constant curvature cusp at one end, and a flat manifold on the other end. We prove that this is the only gradient soliton with this topology, provided the curvature is negatively pinched, -1/4 < sec < 0, at the time-zero manifold (normalizing the soliton to be born at time -1).
We show that if a shrinking soliton is asymptotic to a cone along an end then the isometry group of the cross-section of the cone embeds in the isometry group of the end of the shrinker. We also provide sufficient conditions for the isometries of the end to extend to the entire shrinker.
As part of the general investigation of Ricci flow on complete surfaces with finite total curvature, we study this flow for surfaces with asymptotically conical (which includes as a special case asymptotically Euclidean) geometries. After establishing long-time existence, and in particular the fact that the flow preserves the asymptotically conic geometry, we prove that the solution metric $g(t)$ expands at a locally uniform linear rate; moreover, the rescaled family of metrics $t^{-1}g(t)$ exhibits a transition at infinite time inasmuch as it converges locally uniformly to a complete, finite …
Curvature pinching of asymptotically conical gradient expanding Ricci solitons
本文研究了完整非紧致渐近锥形梯度扩展里奇溶剂的曲率捏紧现象，建立了若干Hamilton-Ivey型曲率捏紧估计，包括三维梯度里奇扩展体的正截面曲率结果。
We prove that a shrinking gradient Ricci soliton which agrees to infinite order at spatial infinity with one of the standard cylindrical metrics on $S^k\times \RR^{n-k}$ for $k\geq 2$ along some end must be isometric to the cylinder on that end. When the underlying manifold is complete, it must be globally isometric either to the cylinder or (when $k=n-1$) to its $\ZZ_2$-quotient.
We prove the existence of Ricci flow starting from a class of metrics with unbounded curvature, which are doubly-warped products over an interval with a spherical factor pinched off at an end. These provide a forward evolution from some known and conjectured finite-time local singularities of Ricci flow, generalizing previous examples. The class also includes metrics with non-compact singular ends which become instantaneously compact. Furthermore, we prove local stability of the forward evolution, which allows us to glue it to other manifolds and create a forward evolution from spaces which ar…
In this paper we first introduce the full expression of the curvature tensor of a real hypersurface $M$ in complex hyperbolic two-plane Grassmannians $SU_{2,m}/S(U_2{\cdot}U_m)$, $m{\ge}2$ from the equation of Gauss. Next we derive a new formula for the Ricci tensor of $M$ in $SU_{2,m}/S(U_2{\cdot}U_m)$. Finally we give a complete classification of Hopf hypersurfaces in complex hyperbolic two-plane Grassmannians $SU_{2,m}/S(U_2{\cdot}U_m)$ with commuting Ricci tensor. Each can be described as a tube over a totally geodesic $SU_{2,m-1}/S(U_2{\cdot}U_{m-1})$ in $SU_{2,m}/S(U_2{\cdot}U_m)$ or a h…
Geometric study of non-constant vector fields making hyperbolic space Ricci-Bourguignon solitons
本文对双曲空间上使 Ricci-Bourguignon 孤立子成立的非常值向量场进行几何研究，刻画其结构，并证明奇数维中对偶形式为接触形式，深化对 Ricci 流自相似解的理解。
$η-$ Hyperbolic Ricci Solitons on the Unit Tangent Bundle of the Hyperbolic Strip
本文研究双曲带及其单位切丛上的Killing场、Ricci孤立子与η-双曲Ricci孤立子，明确了相关几何性质、孤立子存在性及分类结果。
In this paper we establish stability results for symmetric spaces of noncompact type under Ricci flow, i.e. we will show that any small perturbation of the symmetric metric is flown back to the original metric under an appropriately rescaled Ricci flow. It will be important for us which smallness assumptions we have to impose on the initial perturbation. We will find that as long as the symmetric space does not contain any hyperbolic or complex hyperbolic factor, we don't have to assume any decay on the perturbation. Furthermore, in the hyperbolic and complex hyperbolic case, we show stability…
Ricci Flow with hyperbolic warped product metrics
本文证明了在里奇流下双曲积度量的变形中保持负曲率。它还表明，流收敛到一个平坦的度量的时间走向无穷大。
This paper studies the normalized Ricci flow from a slight perturbation of the hyperbolic metric on $\mathbb H^n$. It's proved that if the perturbation is small and decays sufficiently fast at the infinity, then the flow will converge exponentially fast to the hyperbolic metric when the dimension $n>5$.
An Aubin continuity path for asymptotically conical toric shrinking gradient Kähler-Ricci solitons: openness and a solution for $t=0$
本文研究了渐近圆锥托里克收缩梯度凯勒-里奇孤立子的 Aubin 连续路径，证明了初始值参数的开放性及 t=0 的解。
We study the Ricci flow of initial metrics which are C^0-perturbations of the hyperbolic metric on H^n. If the perturbation is bounded in the L^2-sense, and small enough in the C^0-sense, then we show the following: In dimensions four and higher, the scaled Ricci harmonic map heat flow of such a metric converges smoothly, uniformly and exponentially fast in all C^k-norms and in the L^2-norm to the hyperbolic metric as time approaches infinity. We also prove a related result for the Ricci flow and for the two-dimensional conformal Ricci flow.
In this note we study conformal Ricci flow introduced by Arthur Fischer. We use DeTurck's trick to rewrite conformal Ricci flow as a strong parabolic-elliptic partial differential equations. Then we prove short time existences for conformal Ricci flow on compact manifolds as well as on asymptotically flat manifolds. We show that Yamabe constant is monotonically increasing along conformal Ricci flow on compact manifolds. We also show that conformal Ricci flow is the gradient flow for the ADM mass on asymptotically flat manifolds.
Let $D$ be a compact Kähler manifold with trivial canonical bundle and $Γ$ be a finite cyclical group of order $m$ acting on $\mathbb{C} \times D$ by biholomorphisms, where the action on the first factor is generated by rotation of angle $2π/m$. Furthermore, suppose that $Ω_D$ is a trivialisation of the canonical bundle such that $Γ$ preserves the holomorphic form $dz \wedge Ω_D$ on $\mathbb C \times D$, with $z$ denoting the coordinate on $\mathbb{C}$. The main result of this article is the construction of new examples of gradient steady Kähler-Ricci solitons on certain crepant resolutions of…
Positive $τ$-bi-Ricci curvature and Mean curvature flow with surgery in hyperbolic space
该研究证明双曲空间中满足正$τ$-双Ricci曲率的光滑闭连通浸入超曲面存在带有限次手术且可终止的平均曲率流，并推导了相应流形的微分同胚类型与紧区域的拓扑性质。
Uniqueness of asymptotically conical shrinking gradient Kähler-Ricci solitons
本文证明了非紧复流形上在无穷远处Ricci曲率趋于零的收缩梯度Kähler-Ricci孤立子在双全纯同构下的唯一性，且该方法可广泛应用于锥形Calabi-Yau度量唯一性及极化Fano纤维化同构的证明。
Uniqueness of asymptotically conical Kähler-Ricci flow
本文研究了非紧流形上具有锥形初始条件的Kähler-Ricci流的唯一性问题，证明在曲率有界等特定条件下，从孤立子无穷远切锥产生的完备解必定与孤立子关联的前向自相似流重合。
We prove a curvature pinching result for the Ricci flow on asymptotically flat manifolds: if an asymptotically flat manifold of dimension $n\geq 3$ has scale-invariant integral norm of curvature sufficiently pinched relative to the inverse of its Sobolev constant, then the Ricci flow starting from this manifold exists for all positive times and converges to flat Euclidean space. In particular our result implies that the initial manifold must have been diffeomorphic to $\mathbb{R}^n$.
We study the degenerations of asymptotically conical Ricci-flat Kähler metrics as the Kähler class degenerates to a semi-positive class. We show that under appropriate assumptions, the Ricci-flat Kähler metrics converge to a incomplete smooth Ricci-flat Kähler metric away from a compact subvariety. As a consequence, we construct singular Calabi-Yau metrics with asymptotically conical behaviour at infinity on certain quasi-projective varieties and we show that the metric geometry of these singular metrics are homeomorphic to the topology of the singular variety. Finally, we will apply our resul…
We show that every finite volume hyperbolic manifold of dimension greater or equal to 3 is stable under rescaled Ricci flow, i.e. that every small perturbation of the hyperbolic metric flows back to the hyperbolic metric again. Note that we do not need to make any decay assumptions on this perturbation. It will turn out that the main difficulty in the proof comes from a weak stability of the cusps which has to do with infinitesimal cusp deformations. We will overcome this weak stability by using a new analytical method developed by Koch and Lamm.
Using the maximal regularity theory for quasilinear parabolic systems, we prove two stability results of complex hyperbolic space under the curvature-normalized Ricci flow in complex dimensions two and higher. The first result is on a closed manifold. The second result is on a complete noncompact manifold. To prove both results, we fully analyze the structure of the Lichnerowicz Laplacian on complex hyperbolic space. To prove the second result, we also define suitably weighted little Hölder spaces on a complete noncompact manifold and establish their interpolation properties.
We construct non-trapping asymptotically hyperbolic manifolds with boundary conjugate points but no interior conjugate points.
Optimal asymptotic volume ratio for noncompact 3-manifolds with asymptotically nonnegative Ricci curvature and a uniformly positive scalar curvature lower bound
本文研究了具有渐近非负 Ricci 曲率和一致正数量曲率下界的非紧 3 维 Riemannian 流形，证明了若其有 $k$ 个端和有限的第一 Betti 数，则至多线性体积增长，并在曲率负部衰减足够快时得到最佳渐近体积比 $\leq4kπ$。
Characterization of Infinite Ideal Polyhedra in Hyperbolic 3-Space via Combinatorial Ricci Flow
本文通过引入无限理想圆模式的组合Ricci流，在特定组合条件下证明了其刻画，从而肯定地解决了Rivin关于双曲三维空间中无限理想多面体的长期公开问题。
We prove a positive mass theorem for complete Kähler manifolds that are asymptotic to the complex hyperbolic space.
Generalizing the result of Li and Tam for the hyperbolic spaces, we prove an existence theorem on the Dirichlet problem for harmonic maps with $C^1$ boundary conditions at infinity between asymptotically hyperbolic manifolds.
Asymptotically Cylindrical Ricci-Flat Manifolds
渐近柱面Ricci平坦流形在构造拓扑量子场论中起着重要作用。特别重要的是要了解它们在圆柱形端部的行为和几何形状的自然限制。本文证明了具有Ricci平坦度量g的可定向连通渐近圆柱流形（M，g）至多可以有两个圆柱端.在有两个这样的圆柱端的情况下，则在和乐群中有约化Hol（g），并且（M，g）是圆柱。
This paper considers asymptotically hyperbolic manifolds with a finite boundary intersecting the usual infinite boundary -- cornered asymptotically hyperbolic manifolds -- and proves a theorem of Cartan-Hadamard type near infinity for the normal exponential map on the finite boundary. As a main application, a normal form for such manifolds at the corner is then constructed, analogous to the normal form for usual asymptotically hyperbolic manifolds and suited to studying geometry at the corner. The normal form is at the same time a submanifold normal form near the finite boundary and an asympto…
Ricci flow and the scalar curvature rigidity of Einstein manifolds
本研究综述了爱因斯坦流形的线性稳定性、动力学稳定性与标量曲率刚性关联的最新成果，覆盖多类爱因斯坦流形并阐释其与正质量定理的关系。
Closed Ricci Flows with Singularities Modeled on Asymptotically Conical Shrinkers
该研究证明在闭合流形上存在一个里齐流解，其在有限时间形成基于渐近圆锥收缩子流形的奇异性和模型。
Using methods of A. Grigor'yan and L. Saloff-Coste we prove that on a manifold with a conical end the heat kernel has a Gaussian bound. This result is applied to asymptotically conical Kähler manifolds. It is a result of the author and R. Goto that a crepant resolution of a Ricci-flat Kähler cone admits a Ricci-flat Kähler metric asymptotic to the cone metric in every Kähler class. We prove the sharp rate of convergence of the metric to the cone metric. For compact Kähler classes this is the same as for the Ricci-flat ALE metrics of P. Kronheimer and D. Joyce.
Convergences of Combinatorial Ricci Flows to Degenerated Circle Packings in Hyperbolic Background Geometry
该研究针对双曲背景几何中退化圆填充能否实现给定全测地曲率数据的问题，刻画了充要条件并证明唯一性，还借鉴已有方法引入组合Ricci流求解目标退化圆填充曲面。
We show that the mass of an asymptotically hyperbolic manifold with a noncompact boundary can be evaluated via the Ricci tensor and the second fundamental form by using purely coordinates. The method is analog to Miao-Tam's approach to the asymptotically flat manifold.
A discrete uniformization theorem for decorated piecewise hyperbolic metrics on surfaces
本文研究了曲面上高斯曲率的自然离散化，建立了离散单值化定理，并引入带手术的组合$\alpha$-Ricci流和组合$\alpha$-Calabi流，证明了其长期存在性与收敛性，从而解决了预定组合$\alpha$-曲率的带装饰分片双曲度量的存在性问题。
In this paper, we adopt combinatorial Ricci curvature flow methods to study the existence of cusped hyperbolic structure on 3-manifolds with torus boundary. For general pseudo 3-manifolds, we prove the long-time existence and the uniqueness for the extended Ricci flow for decorated hyperbolic polyhedral metrics. We prove that the extended Ricci flow converges to a decorated hyperbolic polyhedral metric if and only if there exists a decorated hyperbolic polyhedral metric of zero Ricci curvature. If it is the case, the flow converges exponentially fast. These results apply for cusped hyperbolic …
Infinitely many non-collapsed steady Ricci solitons on complex line bundles
研究在复射影空间上的复线丛O(k)上构造无限多个非收缩的里奇溶剂，并证明其具有渐近锥形的里奇平坦度量。
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