The lower bound of the Ricci curvature that yields the infinite number of the discrete spectrum of the Laplacian
Hironori Kumura
本文讨论Laplace-Beltrami算子的离散谱是无限还是有限的问题。这个问题的曲率的边界行为将被完全确定。
This paper discusses the question whether the discrete spectrum of the Laplace-Beltrami operator is infinite or finite. The borderline-behavior of the curvatures for this problem will be completely determined.
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We define the distance between edges of graphs and study the coarse Ricci curvature on edges. We consider the Laplacian on edges based on the Jost-Horak's definition of the Laplacian on simplicial complexes. As one of our main results, we obtain an estimate of the first non-zero eigenvalue of the Laplacian by the Ricci curvature for a regular graph.
Eigenvalue Estimates of the Hodge Laplacian Under Lower Ricci Curvature Bound
本文在下界里奇曲率限制条件下，研究了闭合黎曼流形上霍奇拉普拉斯算子的特征值估计，并建立了连接拉普拉斯算子的特征值界及微分形式的全局皮卡尔不等式。
Graph discretization of Laplacian on Riemannian manifolds with bounds on Ricci curvature
本文在Ricci曲率有界条件下，通过图近似方法证明了流形拉普拉斯算子特征值的均匀收敛性。
Spectral convergence of graph Laplacians with Ricci curvature bounds and in non-collapsed Ricci limit spaces
本文在Ricci曲率有下界的闭流形及其非坍缩Ricci极限空间上，建立了图拉普拉斯算子特征值与特征函数的高概率谱收敛界，为带奇异点的加权拉普拉斯提供谱逼近。
In this paper, we study monotonicity for the first eigenvalue of a class of $(p,q)$-Laplacian. We find the first variation formula for the first eigenvalue of $(p,q)$-Laplacian on a closed Riemannian manifold evolving by the Ricci-harmonic flow and construct various monotic quantities by imposing some conditions on initial manifold.
Ricci curvature and eigenvalue estimates for the magnetic Laplacian on manifolds
本文给出了具有磁势的闭黎曼流形上磁拉普拉斯算子的Lichnerowicz型估计和（高阶）Buser型估计.这些结果涉及本征值，磁场，里奇曲率，和Cheeger型常数。
We define the Ricci curvature on simplicial complexes by modifying the definition of the Ricci curvature on graphs, and we prove the upper and lower bounds of the Ricci curvature. These properties are generalizations of previous studies. Moreover, we obtain an estimate of the eigenvalues of the Laplacian on simplicial complexes using the Ricci curvature.
Spectrum of the drift Laplacian on Ricci expanders
该文研究Ricci膨胀子上漂移拉普拉斯算子的谱，证明势函数为真时谱离散且该假设不可去，拓展势函数渐近行为结果，算出刚性膨胀/收缩子上全部特征值，还探究了特定刚性Ricci膨胀子的第二特征值。
On closed Riemannian manifolds with Bakry-Émery Ricci curvature bounded from below and bounded gradient of the potential function, we obtain lower bounds for all positive eigenvalues of the Beltrami-Laplacian instead of the drifted Laplacian. The lower bound of the $k$th eigenvalue depends on $k$, Bakry-Émery Ricci curvature lower bound, the gradient bound of the potential function, and the dimension and diameter upper bound of the manifold, but the volume of the manifold is not involved. Especially, these results apply to closed manifolds with Ricci curvature bounded from below.
Lu-Minguzzi-Ohta have introduced the notion of a lower $N$-weighted Ricci curvature bound with $\varepsilon$-range, and derived several comparison geometric estimates from a Laplacian comparison theorem for weighted Laplacian. The aim of this paper is to investigate various rigidity phenomena for the equality case of their comparison geometric results. We will obtain rigidity results concerning the Laplacian comparison theorem, diameter comparisons, and volume comparisons. We also generalize their works for non-symmetric Laplacian induced from vector field potential.
In this article, we prove gradient estimates under Bakry-Emery curvature bounds for unbounded graph Laplacians which satisfy an ellipticity assumption. As applications, we study completeness and finiteness of stochastically complete graphs under Bakry-Emery curvature bounds.
On Harnack inequalities for Witten Laplacian on Riemannian manifolds with super Ricci flows
本文证明了完备黎曼流形上与不定常Witten Laplacian算子相关联的热方程$\partial_t u=Lu$的Li-Yau型Harnack不等式和Hamilton型无量纲Harnack不等式，其中完备黎曼流形上具有$(K, m)$ -超Perelman里奇流和$K$ -超Perelman里奇流的变体.
We obtain a fundamental gap estimate for classes of bounded domains with quantitative control on the boundary in a complete manifold with integral bounds on the negative part of the Ricci curvature. This extends the result of \cite{Oden-Sung-Wang99} to $L^p$-Ricci curvature assumptions, $p>n/2$. To achieve our result, it is shown that the domains under consideration are John domains, what enables us to obtain an estimate on the first nonzero Neumann eigenvalue, which is of independent interest.
Eigenvalues of the Laplacian under the Ricci Flow
在一个技术性假设下，导出了由里奇流演化的闭流形上拉普拉斯算子的特征值的一阶变分公式，并给出了一些应用.
Let $M$ be an $n$-dimensional closed Riemannian manifold with metric $g$, $dμ=e^{-ϕ(x)}dν$ be the weighted measure and $Δ_{p,ϕ}$ be the weighted $p$-Laplacian. In this article we will investigate monotonicity for the first eigenvalue problem of the weighted $p$-Laplace operator acting on the space of functions along the Ricci-Bourguignon flow on closed Riemannian manifolds. We find the first variation formula for the eigenvalues of the weighted $p$-Laplacian on a closed Riemannian manifold evolving by the Ricci-Bourguignon flow and we obtain various monotonic quantities. At the end we find som…
In this paper, we consider the non-linear general $p$-Laplacian equation $Δ_{p,f}u+F(u)=0$ for a smooth function $F$ on smooth metric measure spaces. Assume that a Sobolev inequality holds true on $M$ and an integral Ricci curvature is small, we first prove a local gradient estimate for the equation. Then, as its applications, we prove several Liouville type results on manifolds with lower bounds of Ricci curvature. We also derive new local gradient estimates provided that the integral Ricci curvature is small enough.
Discrete time random walks on a finite set naturally translate via a one-to-one correspondence to discrete Laplace operators. Typically, Ollivier curvature has been investigated via random walks. We first extend the definition of Ollivier curvature to general weighted graphs and then give a strikingly simple representation of Ollivier curvature using the graph Laplacian. Using the Laplacian as a generator of a continuous time Markov chain, we connect Ollivier curvature with the heat equation which is strongly related to continuous time random walks. In particular, we prove that a lower bound o…
Eigenvalue comparison theorems for the Witten-Laplacian and the weighted $p$-Laplacian on complete manifolds with a modified Ricci curvature bounded from below
在具有从下方有界的修正Ricci曲率的完备流形上，建立Witten拉普拉斯算子和加权p-拉普拉斯算子在测地球上的第一狄利克雷特征值的程氏型特征值比较定理。
In this paper, we prove a Laplacian comparison theorem for non-symmetric diffusion operator on complete smooth $n$-dimensional Riemannian manifold having a lower bound of modified $m$-Bakry-Émery Ricci tensor under $m\leq 1$ in terms of vector fields. As consequences, we give the optimal conditions for modified $m$-Bakry-Émery Ricci tensor under $m\leq1$ such that the (weighted) Myers' theorem, Bishop-Gromov volume comparison theorem, Ambrose-Myers' theorem, Cheng's maximal diameter theorem, and the Cheeger-Gromoll type splitting theorem hold. Some of these results were well-studied for $m$-Ba…
On the first eigenvalue of the Witten-Laplacian and the diameter of compact shrinking Ricci solitons
证明了紧致黎曼流形上Witten-Laplacian算子第一非零特征值的一个下界估计。作为应用，我们得到了紧致梯度收缩Ricci孤子直径的一个下界估计.我们的结果改进了第一作者和Y. Sano在[12]和B. Andrews和L. Ni在[1]中。此外，我们将直径估计推广到中曲率流的紧致自相似收缩器。
Sharp lower bound of the first eigenvalue of the $p$-Laplacian under integral Ricci curvature
该研究针对p≥2的闭流形，在小积分里奇曲率条件下，结合Sobolev截断的全局椭圆估计与一维比较剖面的严格扰动，证明了p-拉普拉斯算子第一非零特征值的尖锐Zhong-Yang型下界。
Harnack inequalities and $W$-entropy formula for Witten Laplacian on Riemannian manifolds with $K$-super Perelman Ricci flow
本文证明了具有$K$ -超Perelman里奇流的完备黎曼流形上Witten Laplacian热半群的对数Sobolev不等式，并得到了其Hamilton Harnack不等式.建立了Witten Laplacian热方程的$W$ -熵公式，证明了满足$CD(K, m)$条件的完备黎曼流形上的一个刚性定理，并将$W$ -熵公式推广到具有$(K, m)$ -超Perelman里奇流的紧致黎曼流形上的含时Witten Laplacian，其中$K\in \mathbb{R}$和$m\in [n, \infty]$是两个常数.最后，我们证明了在具有$(K, m)$ -super里奇流的变形的紧致流形或完备流形上与含时Witten Laplacian相关的热方程$\partial_t u=Lu$的正解的Li-Yau和Li-Yau-Hamilton Harnack不等式.
Lower diameter bounds for compact shrinking Ricci solitons
证明了紧致收缩Ricci孤子的直径存在普适的下界。通过推广紧致黎曼流形上具有下里奇曲率的Laplacian算子的第一非零特征值的普适估计，证明了这一点.
Eigenvalues of Weighted-Laplacian under the extended Ricci flow
设$Δ_φ= Δ-\nabla φ\nabla$是$n$维紧致黎曼流形$(M,g)$上具有不变加权体积测度$dμ= e^{-φ} dv$的对称扩散算子，其中$g=g(t)$求解扩展的里奇流.本文研究了$Δ_φ$的第一非零特征值的演化和单调性，在一定的技术假设下，得到了沿推广的里奇流及其保体积流的几个单调量.我们还表明，特征值发散的情况下$n\geq 3$在有限的时间。我们的结果是Laplace-Beltrami算子在各种几何流下的一些已知结果的自然推广。
Sharp estimate on the first eigenvalue of the p-Laplacian on compact manifold with nonnegative Ricci curvature
证明了具有非负里奇曲率且可能具有凸边界的紧致黎曼流形上的p-Laplacian的第一非零特征值的精确估计（在这种情况下我们假设Neumann b.c.在p-Laplacian上）.证明是基于梯度比较定理。我们还将在估计中描述等式的情况。
Integral Ricci curvature bounds for possibly collapsed spaces with Ricci curvature bounded from below
假设一个完整的黎曼流形的里奇曲率的下界，$p< 1/2$，我们显示存在的局部$L^p$规范的里奇曲率，只依赖于尺寸和提高体积塌陷的界限。
Positivity of Ricci curvature under the Kähler--Ricci flow
对所有复维数n>=2，我们构造了具有有界曲率和非负里奇曲率的完备Kaehler流形，其Kaehler-Ricci演化立即获得混合号的里奇曲率.
Expanding Ricci solitons with pinched Ricci curvature
本文证明了具有（正）压缩里奇曲率的扩展梯度里奇孤子是平凡孤子。也就是说，它们要么是紧凑的，要么是扁平的。
We extend the concept of singular Ricci flow by Kleiner and Lott from 3d compact manifolds to 3d complete manifolds with possibly unbounded curvature. As an application of the generalized singular Ricci flow, we show that for any 3d complete Riemannian manifold with non-negative Ricci curvature, there exists a smooth Ricci flow starting from it.
Existence, Lifespan and Transfer Rate of Ricci Flows on Manifolds with Small Ricci Curvature
我们发现，在4维及以上，里奇流的寿命取决于相对较小的里奇曲率相比，黎曼曲率的初始流形。我们可以将这个寿命估计推广到局部里奇流，利用它证明了曲率至多为二次增长的非紧黎曼流形上里奇流解的短时存在性，其中在黎曼曲率大的区域，其里奇曲率及其前两阶导数足够小.这些里奇流解可能具有无界曲率。此外，我们的方法意味着，在一些适当的假设下，空间传输率（高曲率区域影响低曲率区域的速率）的里奇流类似于热方程。
Complete non-compact gradient Ricci solitons with nonnegative Ricci curvature
本文给出了具有非负里奇曲率的完全非紧扩张（或定常）梯度Ricci孤子的数量曲率的时滞估计。作为应用，我们证明了任何具有正压缩里奇曲率的完全非紧膨胀（或定常）梯度Kähler-Ricci孤子都是Ricci平坦的.这一结果回答了Chow，Lu和Ni在一本书中提出的Kähler-Ricci孤子的问题。
Sharp estimates on the first eigenvalue of the p-Laplacian with negative Ricci lower bound
当里奇曲率由一个负的常数从下而上有界时，我们通过对非线性算子$Δ_p$的第一个非零特征值提供尖锐的估计，完成了紧致流形上p-Laplacian的尖锐特征值估计的图画.我们假设流形的边界是凸的，并在其上施加Neumann边界条件，证明是基于精细的梯度比较技术和对底层模型空间的仔细分析。
Monotonicity of eigenvalues of geometric operaters along the Ricci-Bourguignon flow
本文研究了Laplacian型算子$-Δ+cR$的特征值沿Ricci-Bourguignon流的单调性，其中$c$为常数.对于$c\neq0$，我们得到了Laplacian型算子$-Δ+cR$的最低特征值的单调性，推广了Cao \cite{Cao2007}的一些结果.对于$c=0$，我们得到了Laplacian第一特征值的单调性，推广了Ma \cite{Ma2006}的一些结果.进一步证明了当$(M_{3}, g_{0})$是一个具有正Ricci曲率的闭三元流形时，Laplacian算子的特征值在一个有限的极大时间区间$[0, T)$上按$t \rightarrow T$发散，推广了Cerbo和Fabrizio \cite{Fabrizio2007}的一些结果.
The notion of the Ricci curvature is defined for sprays on a manifold. With a volume form on a manifold, every spray can be deformed to a projective spray. The Ricci curvature of a projective spray is called the projective Ricci curvature. In this paper, we introduce the notion of projectively Ricci-flat sprays. We establish a global rigidity result for projectively Ricci-flat sprays with nonnegative Ricci curvature. Then we study and characterize projectively Ricci-flat Randers metrics.
Curvature Estimates for Four-Dimensional Gradient Steady Ricci Solitons
本文给出了具有正里奇曲率和数量曲率衰减的四维梯度稳定Ricci孤子的曲率估计。
Riemannian Submersions Need Not Preserve Positive Ricci Curvature
如果$π:M\rightarrow B$是一个黎曼浸没，并且$M$具有正的截面曲率，那么O'Neill的水平曲率方程表明$B$也必须具有正的曲率。证明了从具有正里奇曲率的紧致流形到具有小邻域的（任意）负里奇曲率的流形存在黎曼浸没，但从具有正里奇曲率的流形到具有非正里奇曲率的流形不存在黎曼浸没。
We study the non Ricci flat gradient steady Kähler Ricci soliton with non-negative Ricci curvature and weak integrability condition of the scalar curvature $S$, namely $\underline{\lim}_{r\to \infty} r^{-1}\int_{B_r} S=0$, and show that it is a quotient of $Σ\times \mathbb{C}^{n-1-k}\times N^k$, where $Σ$ and $N$ denote the Hamilton's cigar soliton and some compact Kähler Ricci flat manifold respectively. As an application, we prove that any non Ricci flat gradient steady Kähler Ricci soliton with $Ric\geq 0$, together with subquadratic volume growth or $\limsup_{r\to \infty} rS<1$ must have u…
Ricci-mean curvature flows in gradient shrinking Ricci solitons
Huisken研究了欧几里得空间中的中曲率流在发生I型奇点时的渐近行为，证明了其重标度流在欧几里得空间中收敛于自收缩流.本文将这一结果推广到沿由梯度收缩Ricci孤子构成的里奇流运动的Ricci-中曲率流。
We construct a uniform local bound of curvature operator from local bounds of Ricci curvature and injectivity radius among all $n$-dimensional Ricci flows. Thus new compactness theorems for the Ricci flow and Ricci solitons are derived. In particular, we show that every Ricci flow with $|Ric|\leq K$ must satisfy $|Rm|\leq Ct^{-1}$ for all $t\in (0,T]$, where $C$ depends only on the dimension $n$ and $T$ depends on $K$ and the injectivity radius $inj_{g(t)}$. In the second part of this paper, we discuss the behavior of Ricci curvature and its derivative when the injectivity radius is thoroughly…
In this paper, we introduce the weighted projective Ricci curvature as an extension of projective Ricci curvature introduced by Z. Shen. We characterize the class of Randers metrics of weighted projective Ricci flat curvature. We find the necessary and sufficient condition under which a Kropina metric has weighted projective Ricci flat curvature. Finally, we show that every projectively flat metric with isotropic weighted projective Ricci and isotropic S-curvature is a Kropina metric or Randers metric.
Injectivity radius bound of Ricci flow with positive Ricci curvature and applications
本文研究了三维里奇流的内射半径界。作为应用，我们证明了具有正里奇曲率的里奇流的长时间存在性.我们还部分解决了Chow-Lu-Ni（2006）书中第302页的一个问题。
Weak Ricci curvature bounds for Ricci shrinkers
我们表明，对于一个完整的Ricci收缩存在一个序列的点趋于无穷大的Ricci张量的范数增长最多线性。
On gradient Ricci solitons with constant scalar curvature
利用等参函数理论研究了具有常数数量曲率的梯度Ricci孤子。在Ricci张量满足一定条件的情况下，证明了具有常数量曲率的梯度Ricci孤子的刚性，这些条件在曲率齐次流形上都满足.这导致一个完整的描述四维和六维Kaehler梯度Ricci孤子与常数数量曲率。
In this paper, we give a description for steady Ricci solitons with a linear decay of sectional curvature. In particular, we classify all 3-dimensional steady Ricci solitons and 4-dimensional $κ$-noncollpased steady Ricci solitons with nonnegative sectional curvature under the linear curvature decay.
On Ricci curvature and volume growth in dimension three
证明了R^3上的完备度量减去一个具有非负里奇曲率和二次Ricci曲率衰减的球，具有立方体积增长。
Ricci flow and the determinant of the Laplacian on non-compact surfaces
在有边界或无边界的紧致曲面上，Osgood、Phillips和Sarnak证明了在具有固定面积的共形度量类中拉普拉斯算子行列式的最大值出现在常曲率度量处，并且对于负的欧拉示性数，表现出从给定度量到常曲率度量的流动，行列式沿着该流动增加。本文的目的是对端点渐近于双曲漏斗或尖点的非紧曲面上的拉普拉斯行列式进行类似的分析。在这种情况下，我们表明，里奇流收敛到一个度量的常曲率和行列式增加沿此流。
Steady Ricci solitons with horizontally $ε$-pinched Ricci curvature
本文证明了任何具有非负曲率算子和水平里奇曲率的$ε$ -非坍缩梯度稳定Ricci孤子必是旋转对称的。作为应用，我们证明了任何具有非负曲率算子的$κ$ -非坍缩梯度定常Ricci孤子$(M^n, g,f)$必是旋转对称的，如果它存在唯一的平衡点，且其数量曲率$R(x)$满足$\lim_{r(x)\rightarrow\infty}R(x)f(x)=C_0\sup_{x\in M}R(x)$，其中$C_0>\frac{n-2}{2}$ .
For an embedded submanifold $Σ\subset\mathbb{R}^{N}$, Belkin and Niyogi showed that one can approximate the Laplacian operator using heat kernels. Using a definition of coarse Ricci curvature derived by iterating Laplacians, we approximate the coarse Ricci curvature of submanifolds $Σ$ in the same way. For this purpose, we derive asymptotics for the approximation of the Ricci curvature proposed in [AW19]. Specifically, we prove Proposition 3.2 in [AW19].
A note on two-positive Ricci curvature and positive Einstein curvature
本文讨论了最近关于双正里奇曲率的一些结果及其对正Einstein曲率的应用。
Metrics of positive Ricci curvature on bundles
我们构造了正里奇曲率流形的新例子，拓扑上，几乎非负里奇曲率紧致流形上的向量丛。特别地，我们证明了：如果E是紧致流形上具有非负里奇曲率的向量丛的全空间，则E与R^p的乘积对所有大p都存在正里奇曲率的完备度量.
Manifolds with A Lower Ricci Curvature Bound
本文综述了具有里奇曲率下界的流形的结构。
Curvature tensor under the Ricci-Harmonic flow
证明了若里奇曲率在Ricci-Harmonic流下对所有时间$t$ \in [0，T）都是一致有界的，则曲率张量也必须是一致有界的.
Uniqueness of asymptotic cones of complete noncompact shrinking gradient Ricci solitons with Ricci curvature decay
本文讨论了（1）Brett Kotschwar和Lu Wang以及（2）Ovidiu Munteanu和Jiaping Wang工作的一个基本结果。
Weak stability of Ricci expanders with positive curvature operator
证明了具有正曲率算子和二次曲率衰减的扩展梯度Ricci孤子在无穷远处的弱稳定性。
Ancient Ricci flows with nonnegative Ricci curvature
本文研究了非负曲率非塌陷古老里奇流的渐近几何，通过其无穷远处的非塌陷F-极限度量孤子得出两个分歧定理。
We establish a dichotomy on the curvature decay for four dimensional complete noncompact non Ricci flat steady gradient Ricci soliton with linear curvature decay and proper potential function. A similar dichotomy is also shown in higher dimensions under the additional assumption that the Ricci curvature is nonnegative outside a compact subset.
On the moment-angle manifolds with positive Ricci curvature
在某些矩角流形上构造了正里奇曲率的黎曼度量.
Optimal transport and Ricci curvature for metric-measure spaces
本文综述了Lott-Villani和Sturm关于度量-测度空间的里奇曲率下界的研究工作。
Manifolds with Pointwise Ricci Pinched Curvature
本文证明了具有任意点态压缩里奇曲率张量的黎曼流形的一个紧性结果。
On the Ricci curvature of normal metrics on Biquotients
证明了具有有限基本群的闭双商上的任意正规度量都具有正的里奇曲率.
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