X-X. Chen, S. K. Donaldson
This paper extends our earlier results to higher dimensions using a different approach, based on the rigidity of complex structures on certain domains.
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The object of the present paper is to study some properties of para-K$ä$hler manifold whose metric is conformal Einstein soliton. We have studied some certain curvature properties of para-K$ä$hler manifold admitting conformal Einstein soliton.
K{ä}hler Einstein manifolds and the Calabi curvature operator
本研究针对卡拉比流形上的卡拉比曲率算子，证明其满足不同正性条件时对应标量曲率、里奇曲率等的正性结论，还得出满足特定条件的紧卡拉比爱因斯坦流形必具有非负常全纯截面曲率的贡献。
Let $M^n$ be a complete noncompact K$\ddot{a}$hler manifold of complex dimension $n$ with nonnegative holomorphic bisectional curvature. Denote by $\mathcal{O}$$_d(M^n)$ the space of holomorphic functions of polynomial growth of degree at most $d$ on $M^n$. In this paper we prove that $$dim_{\mathbb{C}}{\mathcal{O}}_d(M^n)\leq dim_{\mathbb{C}}{\mathcal{O}}_{[d]}(\mathbb{C}^n),$$ for all $d>0$, with equality for some positive integer $d$ if and only if $M^n$ is holomorphically isometric to $\mathbb{C}^n$. We also obtain sharp improved dimension estimates when its volume growth is not maximal or…
The aim of this thesis is to construct new examples of compact orbifolds $\mathcal{O}^4(Θ)$ which admit a self dual Einstein (SDE) metric of positive scalar curvature $s>0$, with a one-dimensional group of isometries. In particular we want to prove that these examples are different from those described by Boyer, Galicki and Piccinni in \emph{$3-$Sasakian geometry, nilpotents orbits, and exeptional quotients}. We construct explicitly our new examples as quaternion-K$\ddot{\mathrm{a}}$hler reductions of the quaternion K$\ddot{\mathrm{a}}$hler Grassmannian $Gr_4(\mathbb{R}^8)$ by an isometric act…
We describe and construct here pseudo-Hermitian structures $θ$ without torsion (i.e. with transversal symmetry) whose Webster-Ricci curvature tensor is a constant multiple of the exterior differential $dθ$. We call these structures pseudo-Hermitian Einstein and our result states that they all can be derived locally from K{ä}hler-Einstein metrics. Moreover, we discuss the corresponding Fefferman metrics of the pseudo-Hermitian Einstein structures. These Fefferman metrics are never Einstein, but they are locally always conformally Einstein.
Rigidity of complete Kähler--Einstein metrics under cscK perturbations
本文研究完备非紧Kähler-Einstein流形上cscK度量的刚性，证明Bergman度量在常标量曲率下为Kähler-Einstein，并结合Cheng猜想解决给出有界严格伪凸域的球形刻画。
On the stability of Einstein metrics carrying a special twisted spinor
本文研究了携带特殊扭转旋量的爱因斯坦度量的稳定性，证明了其线性半稳定性并扩展了相关稳定性的结果。
We obtain a necessary and sufficient condition of existence of a K{ä}hler-Einstein metric on a $G\times G$-equivariant Fano compactification of a complex connected reductive group $G$ in terms of the associated polytope. This condition is not equivalent to the vanishing of the Futaki invariant. The proof relies on the continuity method and its translation into a real Monge-Amp{è}re equation, using the invariance under the action of a maximal compact subgroup $K\times K$.
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。
An Einstein manifold is called scalar curvature rigid if there are no compactly supported volume-preserving deformation of the metric which increase the scalar curvature. We give various characterizations of scalar curvature rigidity for open Einstein manifolds as well as for closed Einstein manifolds. As an application, we construct mass-decreasing perturbations of the Riemannian Schwarzschild metric and the Taub-Bolt metric.
In this paper, we consider some rigidity results for the Einstein metrics as the critical points of some known quadratic curvature functionals on complete manifolds, characterized by some point-wise inequalities. Moreover, we also provide rigidity results by the integral inequalities involving the Weyl curvature, the trace-less Ricci curvature and the Sobolev constant, accordingly.
Bergman--Einstein Rigidity for Hartogs Domains over Bounded Homogeneous Domains
本文证明了在覆盖有界同构域的Hartogs域上Bergman度量的刚性定理，展示了Bergman度量为Kähler-Einstein度量、同构、与单位球体双全纯等条件的等价性，回答了Yau的问题。
In this paper, we prove some rigidity results for the Einstein metrics as the critical points of a family of known quadratic curvature functionals on closed manifolds, characterized by some point-wise inequalities. Moreover, we also provide a few rigidity results that involve the Weyl curvature, the trace-less Ricci curvature and the Yamabe invariant, accordingly.
We study rigidity results for the Einstein metrics as the critical points of a family of known quadratic curvature functionals involving the scalar curvature, the Ricci curvature and the Riemannian curvature tensor, characterized by some pointwise inequalities involving the Weyl curvature and the traceless Ricci curvature. Moreover, we also provide a few rigidity results for locally conformally flat critical metrics.
Given a convex body $K \subset \mathbb{R}^n$ with the barycenter at the origin we consider the corresponding K{ä}hler-Einstein equation $e^{-Φ} = \det D^2 Φ$. If $K$ is a simplex, then the Ricci tensor of the Hessian metric $D^2 Φ$ is constant and equals $\frac{n-1}{4(n+1)}$. We conjecture that the Ricci tensor of $D^2 Φ$ for arbitrary $K$ is uniformly bounded by $\frac{n-1}{4(n+1)}$ and verify this conjecture in the two-dimensional case. The general case remains open.
In this paper, we give an optimal inequality relating the relative Yamabe invariant of a certain compactification of a conformally compact Poin-car{é}-Einstein manifold with the Yamabe invariant of its boundary at infinity. As an application, we obtain an elementary proof of the rigidity of the hyper-bolic space as the only conformally compact Poincar{é}-Einstein manifold with the round sphere as its conformal infinity.
A differential operator introduced by A. Gray on the unit sphere bundle of a Kähler-Einstein manifold is studied. A lower bound for the first eigenvalue of the Laplacian for the Sasaki metric on the unit sphere bundle of a Kähler-Einstein manifold is derived. Some rigidity theorems classifying complex space forms amongst compact Hermitian surfaces and the product of two projective lines amongst all Kähler-Einstein surfaces are then derived.
Any $6$-dimensional strict nearly Kähler manifold is Einstein with positive scalar curvature. We compute the coindex of the metric with respect to the Einstein-Hilbert functional on each of the compact homogeneous examples. Moreover, we show that the infinitesimal Einstein deformations on $F_{1,2}=\mathrm{SU}(3)/T^2$ are not integrable into a curve of Einstein metrics.
Let (M, g) be a compact Einstein manifold with non-empty boundary. We prove that Killing fields at the boundary extend to Killing fields of any (M, g) provided the boundary is weakly convex and a simple condition on the fundamental group holds. This gives a new proof of the classical infinitesimal rigidity of convex surfaces in Euclidean space and generalizes the result to Einstein metrics of any dimension.
In this paper we consider a perturbation of the Ricci solitons equation proposed in \cite{jpb1} and studied in \cite{CaMa} and we classify noncompact gradient shrinkers with bounded nonnegative sectional curvature.
The paper is centered around a new proof of the infinitesimal rigidity of smooth closed surfaces with everywhere positive Gauss curvature. We use a reformulation that replaces deformation of an embedding by deformation of the metric inside the body bounded by the surface. The proof is obtained by studying derivatives of the Hilbert-Einstein functional with boundary term. This approach is in a sense dual to proving the Gauss infinitesimal rigidity, that is rigidity with respect to the Gauss curvature parametrized by the Gauss map, by studying derivatives of the volume bounded by the surface. We…
A Rigidity theorem on conformally compact Einstein manifolds in high dimensions
本文在高维情况下建立了 conformally compact Einstein 流形的刚性定理，扩展了四维结果。
Rigidity for Einstein manifolds under bounded covering geometry
本文证明了有界覆盖几何下爱因斯坦流形的三个刚性结果：几乎平坦必平坦，非零几乎最大体积熵导致双曲，一致局部重绕几乎最大体积导致等距于空间形式。
Rigidity for inscribed radius estimate of asymptotically hyperbolic Einstein manifold
本文将紧流形内切半径上界及刚性结果推广到渐近双曲爱因斯坦流形，通过证明相对体积上界并结合已有工作得到刚性。
Rigidity of Poincaré-Einstein manifolds with flat Euclidean conformal infinity
本文证明了共形无穷远为平坦欧氏空间的庞加莱-爱因斯坦流形的刚性定理，通过分析曲率张量在适配边界定义函数水平集上的传播完成证明，并给出非紧共形无穷远例子及与欧氏体积增长里奇平坦流形的类比。
Rigidity of weighted Einstein smooth metric measure spaces
本文研究了加权爱因斯坦光滑度量测度空间的几何结构，给出了完整的局部分类，并证明了完备情形下流形要么是空间形式的加权类比，要么属于特定的爱因斯坦扭曲积族。
We call a metric quasi-Einstein if the $m$-Bakry-Emery Ricci tensor is a constant multiple of the metric tensor. This is a generalization of Einstein metrics, which contains gradient Ricci solitons and is also closely related to the construction of the warped product Einstein metrics. We study properties of quasi-Einstein metrics and prove several rigidity results. We also give a splitting theorem for some Kähler quasi-Einstein metrics.
Rigidity of compact four-dimensional weakly Einstein Ricci Solitons
该研究证明紧致四维弱爱因斯坦里奇孤子必为爱因斯坦，非平凡紧致情形归约为梯度收缩情形，通过微分与曲率恒等式推导得势函数关系，不存在紧致真弱爱因斯坦四维流形具里奇孤子结构，非紧致齐次例凸显紧致性假设的必要性。
We derive some elliptic differential inequalities from the Weitzenböck formulas for the traceless Ricci tensor of a Kähler manifold with constant scalar curvature and the Bochner tensor of a Kähler-Einstein manifold respectively. Using elliptic estimates and maximum principle, some $L^p$ and $L^\infty $ pinching results are established to characterize Kähler-Einstein manifolds among Kähler manifolds with constant scalar curvature, and others are given to characterize complex space forms among Kähler-Einstein manifolds. Finally, these pinching results may be combined to characterize complex spa…
On the rigidity of generalized $m$-quasi-Einstein manifolds of Yamabe-type
本文研究Yamabe型广义$m$-拟爱因斯坦流形的刚性，证明在自然条件下势向量场要么恒为零要么成为非平凡Killing向量场。
Using the new diffeomorphism invariants of Seiberg and Witten, a uniqueness theorem is proved for Einstein metrics on compact quotients of irreducible 4-dimensional symmetric spaces of non-compact type. The proof also yields a Riemannian version of the Miyaoka-Yau inequality.
Let $(M^n,g)$, $n \ge 4$, be a compact simply-connected Riemannian manifold with nonnegative isotropic curvature. Given $0<l\le L$, we prove that there exists $\eps = \eps (l,L,n)$ satisfying the following: If the scalar curvature $s$ of $g$ satisfies $$ l \le s \le L $$ and the Einstein tensor satisfies $$ | Ric - \frac {s}{n}g | \le \eps$$ then $M$ is diffeomorphic to a symmetric space of compact type. This is a smooth analogue of the result of S. Brendle that a compact Einstein manifold with nonnegative isotropic curvature is isometric to a locally symmetric space.
The paper is centered around a new proof of the infinitesimal rigidity of convex polyhedra. The proof is based on studying derivatives of the discrete Hilbert-Einstein functional on the space of "warped polyhedra" with a fixed metric on the boundary. This approach is in a sense dual to using derivatives of the volume in order to prove the Gauss infinitesimal rigidity of convex polyhedra, which deals with deformations that preserve face normals and face areas. In the spherical and in the hyperbolic-de Sitter space, there is a perfect duality between the Hilbert-Einstein functional and the volum…
Rigidity of complete non-compact generalized m-quasi-Einstein manifolds
研究常数量曲率$R \le 0$、孤子函数$\lambda > 0$且$m > 1$的完备非紧梯度广义$m$-拟爱因斯坦流形，通过引入加权函数$v = e^{-f/m}\lambda$并证明其次调和性，得到五个刚性结果，每个都迫使流形为欧几里得空间。
We compute the spectra of the Laplace-Beltrami operator, the connection Laplacian on 1-forms and the Einstein operator on symmetric 2-tensors on the sine-cone over a positive Einstein manifold $(M, g)$. We conclude under which conditions on $(M,g)$, the sine-cone is dynamically stable under the singular Ricci-de Turck flow and rigid as a singular Einstein manifold
Rigidity of Einstein manifolds with positive Yamabe invariant
本文推广了四维中关于标量曲率的最优界至任意维度的正 Yamabe 不变量 Einstein 流形，并改进了低维流形的 Yamabe 不变量界，还探讨了 Weyl 张量的代数不等式。
Rigidity of the gradient estimate for Einstein manifolds
该研究探讨了Einstein流形梯度估计的刚性，证明在特定条件下流形为平坦，并展示了曲率在$ L^p $空间中的性质，结合已有成果得出ALE的最佳阶数结论。
Rigidity of conformal submersions and quasi-Einstein manifolds
本文研究仿射子浸入和准爱因斯坦流形的刚性概念，通过子浸入技术证明了闭合准爱因斯坦流形在λ>0时的刚性结果，探讨了曲率条件对子浸入和相关流形刚性的影响。
We prove that the bi-invariant Einstein metric on $SU_{2n+1}$ is isolated in the moduli space of Einstein metrics, even though it admits infinitesimal deformations. This gives a non-Kähler, non-product example of this phenomenon adding to the famous example of $\mathbb{CP}^{2n}\times\mathbb{CP}^{1}$ found by Koiso. We apply our methods to derive similar solitonic rigidity results for the Kähler--Einstein metrics on `odd' Grassmannians. We also make explicit a connection between non-integrable deformations and the dynamical instability of metrics under Ricci flow.
The orthogonal decomposition of the Webster curvature provides us a way to characterize some canonical metrics on a pseudo-Hermitian manifold. We derive some subelliptic differential inequalities from the Weitzenböck formulas for the traceless pseudo-Hermitian Ricci tensor and the Chern-Moser tensor of Sasakian manifolds with constant pseudo-Hermitian scalar curvature and Sasakian pseudo-Einstein manifolds respectively. By means of either subelliptic estimates or maximum principle, some rigidity theorems are established to characterize Sasakian pseudo-Einstein manifolds among Sasakian manifold…
Gradient Einstein-type warped products: rigidity, existence and nonexistence results via a nonlinear PDE
本文确立了构造梯度 Einstein 型扭曲度量的充要条件，导出了一般 Lichnerowicz 方程并证明了非线性椭圆方程正解的梯度估计，进而给出了此类度量的非存在性、刚性结果及显式构造实例。
Rigidity of five-dimensional quasi-Einstein manifolds with constant scalar curvature
本文研究五维常标量曲率拟爱因斯坦流形的刚性问题，证明当$k=3$时该类流形具有刚性性质。
We re-visit the eigenvalue estimate of the Dirac operator on spin manifolds with boundary in terms of the first eigenvalues of conformal Laplace operator as well as the conformal mean curvature operator. These problems were studied earlier by Hijazi-Montiel-Zhang and Raulot and we re-prove them under weaker assumption that a boundary chirality operator exists. Moreover, on these spin manifolds with boundary, we show that any $C^{3,α}$ conformal compactification of some Poincare-Einstein metric must be the standard hemisphere when the first nonzero eigenvalue of the Dirac operator achieves its …
In this paper we prove that a conformally compact Einstein manifold with the round sphere as its conformal infinity has to be the hyperbolic space. We do not assume the manifolds to be spin, but our approach relies on the positive mass theorem for asymptotic flat manifolds. The proof is based on understanding of positive eigenfunctions and compactifications obtained by positive eigenfunctions.
Rigidity of quasi-Einstein metrics: The incompressible case
研究向量场无散度且非零的拟爱因斯坦度量，闭流形上的刚性，发现其总容许由该向量场生成的单参数等距群，并给出几何与拓扑限制。
Inspired by the study of $V$-static manifold about classification, in this article, we apply the recent results obtained by Freitas and Gomes (Compact gradient Einstein-type manifolds with boundary, 2022) to prove the rigidity results for compact gradient Einstein-type manifolds with nonempty boundary and constant scalar curvature under some suitable pinching conditions. As a special case of gradient Einstein-type manifold, we also give a rigidity result of $(m,ρ)$-quasi-Einstein manifold with boundary.
Let $(X^{n},g_+) $ $(n\geq 3)$ be a Poincaré-Einstein manifold which is $C^{3,α}$ conformally compact with conformal infinity $(\partial X, [\hat{g}])$. On the conformal compactification $(\overline{X}, \bar g=ρ^2g_+)$ via some boundary defining function $ρ$, there are two types of Yamabe constants: $Y(\overline{X},\partial X,[\bar g])$ and $Q(\overline{X},\partial X,[\bar g])$. (See definitions (\ref{def.type1}) and (\ref{def.type2})). In \cite{GH}, Gursky and Han gave an inequality between $Y(\overline{X},\partial X,[\bar g])$ and $Y(\partial X,[\hat{g}])$. In this paper, we first show that …
Let (M,g) be a compact oriented Einstein 4-manifold. Write R-plus for the part of the curvature operator of g which acts on self-dual 2-forms. We prove that if R-plus is negative definite then g is locally rigid: any other Einstein metric near to g is isometric to it. This is a chiral generalisation of Koiso's Theorem, which proves local rigidity of Einstein metrics with negative sectional curvatures. Our hypotheses are roughly one half of Koiso's. Our proof uses a new variational description of Einstein 4-manifolds, as critical points of the so-called poure connection action S. The key step i…
A rigidity result for axisymmetric toric Ricci solitons
该研究针对Firester-Tsiamis（2024）中的轴对称环面Einstein流形与Ricci孤立子，分析其非轴对称扰动，证明了除共形平坦情形外无恒定角度非轴对称扰动的刚性结果，并给出新情形下Einstein度量的显式描述与体积坍缩假设下的孤立子分类。
In this paper we prove rigidity results on critical metrics for quadratic curvature functionals, involving the Ricci and the scalar curvature, on the space of Riemannian metrics with unit volume. It is well-known that Einstein metrics are always critical points. The purpose of this article is to show that, under some curvature conditions, a partial converse is true. In particular, for a class of quadratic curvature functionals, we prove that every critical metric with non-negative sectional curvature must be Einstein.
We investigate rigidity and stability properties of critical points of quadratic curvature functionals on the space of Riemannian metrics. We show it is possible to "gauge" the Euler-Lagrange equations, in a self-adjoint fashion, to become elliptic. Fredholm theory may then be used to describe local properties of the moduli space of critical metrics. We show a number of compact examples are infinitesimally rigid, and consequently, are isolated critical points in the space of unit-volume Riemannian metrics. We then give examples of critical metrics which are strict local minimizers (up to diffe…
We are concerned in this article with a classical question in spectral geometry dating back to McKean-Singer, Patodi and Tanno: whether or not the constancy of holomorphic sectional curvature of a complex $n$-dimensional compact Kähler manifold can be completely determined by the eigenvalues of its $p$-Laplacian for a \emph{single} integer $p$? We treat this question in this article under two Einstein-type conditions: cohomologically Einstein and Fano Einstein. Building on our previous work, we show that for cohomologically Einstein Kähler manifolds this is true for all but finitely many pairs…
On stability and scalar curvature rigidity of quaternion-Kähler manifolds
本文证明负标量曲率的四元数-凯勒流形作为爱因斯坦流形稳定且标量曲率刚性，并推广到特殊和乐情形，同时构造正标量曲率的半稳定但非刚性的反例。
A rigidity theorem for Einstein $4$-manifolds with sectional curvature of a fixed sign, and its consequences
研究具有半定截面曲率的4维爱因斯坦度量，通过刻画满足特定逐点不等式的此类度量，得出一系列推论，包括在非正曲率闭爱因斯坦及凯勒 - 爱因斯坦4维流形研究中的应用，还得到了凯勒 - 爱因斯坦情形下的尖锐不等式。
Static vacuum near horizon geometries are solutions $(M,g,X)$ of a certain quasi-Einstein equation on a closed manifold $M$, where $g$ is a Riemannian metric and $X$ is a closed 1-form. It is known that when the cosmological constant vanishes, there is rigidity: $X$ vanishes and consequently $g$ is Ricci flat. We study this form of rigidity for all signs of the cosmological constant. It has been asserted that this rigidity also holds when the cosmological constant is negative, but we exhibit a counter-example. We show that for negative cosmological constant if $X$ does not vanish identically, …
New rigidity theorem of Einstein manifolds and curvature operator of the second kind
本文通过Bochner技术证明了满足特定锥条件的高维爱因斯坦流形具有常曲率，并推广了相关研究结果。
Conformal Kähler rigidity of Einstein four-manifolds
研究紧致连通定向爱因斯坦四维流形，通过结合勒布伦共形归一化及相关方程恒等式，证明在特定特征值条件下度量为共形凯勒且有正数量曲率，还得到对完备里奇平坦四维流形等的扩展及挤压定理，K3 曲面等表明假设精确。
We prove structure results for homogeneous spaces that support a non-constant solution to two general classes of equations involving the Hessian of a function and an invariant 2-tensor. We also consider trace-free versions of these systems. Our results generalize earlier rigidity results for gradient Ricci solitons and warped product Einstein metrics. In particular, our results apply to homogeneous gradient solitons of any invariant curvature flow and give a new structure result for homogeneous conformally Einstein metrics.
A rigidity result for a class of compact generalized quasi-Einstein manifolds with constant scalar curvature is obtained. Moreover, under some geometric assumptions, the rigidity for the noncompact case is also proved. Considering non constant scalar curvature, we characterize the generalized quasi-Einstein manifolds which are conformal to the Euclidean space and we show that there exist two classes of complete manifolds, which are obtained by considering potential functions and conformal factors either to be radial or invariant under the action of an (n-1)-dimensional translation group. Expli…
Rigidity of compact quasi-Einstein manifolds with boundary
研究紧致准爱因斯坦流形的几何特性，证明三维和四维情况下的刚性结果，包括标准半球和柱面的等距性。
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