S. Ali Aleyasin, Xiuxiong Chen
Motivated by the results of B. Berndtsson, in this memoir we use the new estimates developed by W. He to extend a theorem of the second author on the existence of weak $C^{1,1}$ geodesics between two smooth non-degenerate Kähler potentials to the case where the metrics on the end points may have singularities on some analytic set and may be positive semi-definite.
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We construct all Finsler metrics on the two-sphere for which geodesics are circles and show that any (reversible) path geometry on a two-dimensional manifold is locally the system of geodesics of a Finsler metric.
This paper is concerned with the existence of conformal metrics of the disk with prescribed Gaussian and geodesic curvatures. Being more specific, given nonnegative smooth functions $K: \overline{\mathbb{D}} \to \mathbb{R}$ and $h: \partial \mathbb{D} \to \mathbb{R}$, we consider the problem of finding a conformal metric realizing $K$ and $h$ as Gaussian and geodesic curvatures, respectively. This is the natural analogue of the classical Nirenberg problem posed on the disk. As we shall see, both curvatures play a role in the existence of solutions. Indeed we are able to give existence results …
Holomorphic Bisectional Curvature on Total Spaces of Holomorphic Vector Bundles
该研究针对紧复流形上全纯向量丛全空间，建立了具指定全纯双截曲率符号的完备Kähler度量存在的充要条件，还得到非负情形的度量分裂、排除正维基的严格正曲率并构造非正情形的反例。
We obtain simple characterizations of the connected components of the space of closed curves on the 2-sphere whose geodesic curvatures are constrained to lie in an open interval $(κ_1,κ_2)$, in terms of $κ_1$ and $κ_2$. Many results concerning the topology of these spaces are established. In particular, we determine the homeomorphism class of some of these components.
On Conformal Flexibility of Completeness and Minimizing Geodesics on Hilbert Manifolds
研究希尔伯特流形上完备性相关问题，通过共形变形得到度量和测地线完备且有长度极小化测地线的代表，同时建立了度量完备性的局部灵活性现象，即能在保持测地线完备性的同时破坏度量完备性。
Closed geodesics with prescribed intersection numbers
本文研究负曲率闭曲面上与给定不相交闭测地线具有指定相交数的素闭测地线计数，通过引入动力学散射算子并利用Pollicott-Ruelle共振理论，给出了其长度趋于无穷时的渐近增长。
We apply a local systolic-diastolic inequality for contact forms and odd-symplectic forms on three-manifolds to bound the magnetic length of closed curves with prescribed geodesic curvature (also known as magnetic geodesics) on an oriented closed surface. Our results hold when the prescribed curvature is either close to a Zoll one or large enough.
A prescribed curvature flow on hyperbolic surfaces with infinite topological type
本文针对无限胞腔分解曲面提出预定曲率流（离散Ricci流模拟），解决预定总测地曲率问题，并证明适定性与收敛性，用于构造双曲度量。
Conformal Metrics on the Disk with Prescribed Negative Gaussian Curvature and Boundary Geodesic Curvature
本文研究了通过共形变换给定圆盘负高斯曲率和边界测地曲率的问题，通过变分方法和发散分析得出存在性结果。
We prove a sharp area estimate for minimal submanifolds that pass through a prescribed point in a geodesic ball in hyperbolic space, in any dimension and codimension. In certain cases, we also prove the corresponding estimate in the sphere. Our estimates are analogous to those of Brendle and Hung in the Euclidean setting.
We give existence results for simple closed curves with prescribed geodesic curvature on $S^{2}$, which correspond to periodic orbits of a charge in a magnetic field.
We prove that a critical metric of the volume functional on a $4$-dimensional compact manifold with boundary satisfying a second-order vanishing condition on the Weyl tensor must be isometric to a geodesic ball in a simply connected space form $\mathbb{R}^{4}$, $\mathbb{H}^{4}$ or $\mathbb{S}^{4}.$ Moreover, we provide an integral curvature estimate involving the Yamabe constant for critical metrics of the volume functional, which allows us to get a rigidity result for such critical metrics.
Blow-up analysis of Large conformal metrics with prescribed Gaussian and geodesic curvatures
本文研究负欧拉示性数带边紧黎曼曲面上指定变号高斯曲率与测地曲率的共形度量存在性，证明小参数下至少存在两个不同共形度量，并分析大解的爆破行为及推导半空间新的 Liouville 型结果。
We prove prime geodesic theorems counting primitive closed geodesics on a compact hyperbolic 3-manifold with length and holonomy in prescribed intervals, which are allowed to shrink. Our results imply effective equidistribution of holonomy and have both the rate of shrinking and the strength of the error term fully symmetric in length and holonomy.
Let $C_{k_1}^{k_2}$ denote the set of all closed curves of class $C^r$ on the sphere $S^2$ whose geodesic curvatures are restricted to lie in $(k_1,k_2)$, furnished with the $C^r$ topology (for some $r >= 2$ and possibly infinite $k_1 < k_2$). In 1970, J. Little proved that the space $C_0^{+\infty}$ of closed curves having positive geodesic curvature has three connected components. Let $r_i = arccot k_i$ (i = 1, 2). We show that $C_{k_1}^{k_2}$ has n connected components $C_1, ..., C_n$, where n is the greatest integer smaller than or equal to $π/(r_1-r_2) + 1$, and $C_j$ contains circles trav…
We study that the $n-$graphs defining by smooth map $f:\Om\subset \ir{n}\to \ir{m}, m\ge 2,$ in $\ir{m+n}$ of the prescribed mean curvature and the Gauss image. We derive the interior curvature estimates $$\sup_{D_R(x)}|B|^2\le\f{C}{R^2}$$ under the dimension limitations and the Gauss image restrictions. If there is no dimension limitation we obtain $$\sup_{D_R(x)}|B|^2\le C R^{-a}\sup_{D_{2R}(x)}(2-\De_f)^{-(\f{3}{2}+\f{1}{s})}, \qquad s=\min(m, n)$$ with $a<1$ under the condition $$\De_f=[\text{det}(\de_{ij}+\sum_\a\pd{f^\a}{x^i}\pd{f^\a}{x^j})]^{\f{1}{2}}<2.$$ If the image under the Gauss m…
We study conformal metrics with prescribed Gaussian curvature on surfaces with conical singularities and geodesic boundary in supercritical regimes. Exploiting a variational argument, we derive a general existence result for surfaces with at least two boundary components. This seems to be the first result in this setting. Moreover, we allow to have conical singularities with both positive and negative orders, that is cone angles both less and grater than $2π$.
Hypersurfaces of constant scalar curvature in hyperbolic space with prescribed asymptotic boundary at infinity
本文推广双曲空间经典渐近普拉托问题，通过构造常数量曲率图极限并引入新技术建立二阶先验估计，证明所有可能曲率值下存在具指定无穷远渐近边界的光滑完备常数量曲率超曲面。
A Variational Characterization of Positive Scalar Curvature Kähler metrics
该研究在紧凯勒流形上引入规定标量曲率测度方程，证明正标量曲率凯勒度量存在性等四个命题等价，还得出正维紧光滑环面凯勒流形的凯勒类必含对应不变度量，且方程有唯一模常数的光滑解。
We give existence and nonuniqueness results for simple planar curves with prescribed geodesic curvature.
Prescribing geodesics and a variational problem for Riemannian metrics
研究给定流形上无参数路径是否与Riemann度量的测地线一致，提出非负泛函并分析其变分方程，揭示其与Yamabe类型的联系，证明在曲面情况下每个共形类中存在唯一的共形临界度量。
We use PDE methods as developed for the Liouville equation to study the existence of conformal metrics with prescribed singularities on surfaces with boundary, the boundary condition being constant geodesic curvature. Our first result shows that a disk with two corners admits a conformal metric with constant Gauss curvature and constant geodesic curvature on its boundary if and only if the two corners have the same angle. In fact, we can classify all the solutions in a more general situation, that of the 2-sphere cut by two planes.
In this follow up work to [45, 33, 32, 46] we introduce and study a notion of geodesic stability restricted to rays with prescribed singularity types. A number of notions of interest fit into this framework, in particular algebraic- and transcendental K-polystability, equivariant K-polystability, and the geodesic K-polystability notion introduced by the author in [46]. We provide a partial comparison of the above notions, and show equivalence of some of these notions provided that the underlying manifold satisfies a certain 'weak cscK' condition. As an application this proves K-polystability o…
We establish exponential mixing for the geodesic flow $φ_t\colon T^1S\to T^1S$ of an incomplete, negatively curved surface $S$ with cusp-like singularities of a prescribed order. As a consequence, we obtain that the Weil-Petersson flows for the moduli spaces ${\mathcal M}_{1,1}$ and ${\mathcal M}_{0,4}$ are exponentially mixing, in sharp contrast to the flows for ${\mathcal M}_{g,n}$ with $3g-3+n>1$, which fail to be rapidly mixing. In the proof, we present a new method of analyzing invariant foliations for hyperbolic flows with singularities, based on changing the Riemannian metric on the pha…
We study the shortest geodesics on flat cone spheres, i.e. flat metrics on the sphere with conical singularities. The length of the shortest geodesic between two singular points can be treated as a function on the moduli space of flat cone spheres with prescribed angle defects. We prove a recurrent relation on the distribution of this function with respect to Thurston's volume form on the moduli space.
In this article, we give results of prescribing scalar and mean curvature functions for metrics either pointwise conformal or conformally equivalent to a Riemannian metric that is equipped on a compact manifold with boundary, with dimensions at least $ 3 $. The results are classified by the sign of the first eigenvalue of the conformal Laplacian. This leads to a "Trichotomy Theorem" in terms of both scalar and mean curvature functions, which is a full extension of the "Trichotomy Theorem" given by Kazdan and Warner. We also discuss prescribing Gauss and geodesic curvature problems on compact R…
In this paper we study K-polystability of arbitrary (possibly non-projective) compact Kähler manifolds admitting holomorphic vector fields. As a main result, we show that existence of a constant scalar curvature Kähler (cscK) metric implies 'geodesic K-polystability', in a sense that is expected to be equivalent to K-polystability in general. In particular, in the spirit of an expectation of Chen-Tang we show that geodesic K-polystability implies algebraic K-polystability for polarized manifolds. Hence our main result recovers a possibly stronger version of results of Berman-Darvas-Lu in this …
The prescribed curvature flow on the disc
本文利用变分特征研究圆盘上预定 Gauss 曲率与边界测地曲率的共形度量存在性，证明了度量收敛或爆破为球冠的规范负梯度流，并通过质心影子流获得了新的存在性结果。
In this paper we prove classification results to elliptic fully nonlinear conformal equations on certain subdomains of the sphere with prescribed constant mean curvature on its boundary. Such subdomains are the hemisphere (or a geodesic ball on $\mathbb{S}^n$) of dimension $n\geq 2$ with prescribed constant mean curvature on its boundary, and annular domains with minimal boundary. Our results extend the classifications of Escobar in \cite{E0} when $n\geq 3$, and Hang-Wang in \cite{HaWa} and Jimenez in \cite{J} when $n=2$.
The problem of immersing a simply connected surface with a prescribed shape operator is discussed. From classical and more recent work, it is known that, aside from some special degenerate cases, such as when the shape operator can be realized by a surface with one family of principal curves being geodesic, the space of such realizations is a convex set in an affine space of dimension at most 3. The cases where this maximum dimension of realizability is achieved have been classified and it is known that there are two such families of shape operators, one depending essentially on three arbitrar…
Let L be the manifold of all (unparametrized) oriented lines of R^3. We study the controllability of the control system in L given by the condition that a curve in L describes at each instant, at the infinitesimal level, an helicoid with prescribed angular speed alpha. Actually, we pose the analogous more general problem by means of a control system on the manifold G_kappa of all the oriented complete geodesics of the three dimensional space form of curvature kappa: R^3 for kappa = 0, S^3 for kappa = 1 and hyperbolic 3-space for kappa = -1. We obtain that the system is controllable if and only…
Non-contractible closed geodesics on compact Finsler space forms without self-intersections
本文研究紧致 Finsler 空间形式上不可缩闭测地线的存在性，证明在实射影平面上至少存在两条不可缩闭测地线并给出长度上界，且在特定曲率条件下证明至少存在 n 条指定同伦类的素不可缩简单闭测地线，同时研究其稳定性。
Braids of Three Strands and Geodesics Shooting in $SL_2(\mathbb{R})$
本文针对三股辫，利用$SL_2(\boldsymbol{\text{R}})$相关几何，提出构造最优几何辫的方法，得到长度最短测地线的刻画与目标方程，扩展了测地线射影的相关公式。
Sharp eigenvalue estimates and related rigidity theorems
本文利用体积与特征值比较及推广的Reilly公式，分别建立Wentzell与漂移Steklov第一非零特征值的尖锐界，并证明等号情形对应等距测地球或Euclidean球的刚性。
Prescribing curvatures on surfaces with conical singularities and corners
本文研究了带锥奇点和角点的带边界紧致曲面上的高斯曲率与测地曲率预定问题，通过将新变分公式推广至奇异情形求得解，是该奇异曲面预定曲率问题的首个结果。
Asymptotic Analysis of Harmonic Maps With Prescribed Singularities
本文作为系列论文首篇，研究带规定奇点的调和映射的渐近行为，为建立多黑洞质量-角动量不等式提供正则性理论，还用于证明极端黑洞近视界极限存在并计算其几何。
On the isometric embedding problem for length metric spaces
本文证明每个真n维长度度量空间可近似等距嵌入洛伦兹空间$\mathbb{R}^{3n+6,1}$，即在预定测地线集上保持能量泛函。
Finite Volume Einstein Finsler Warped Product Manifolds of Non-positive or Non-negative Scalar Curvature
本文研究了非对称芬斯勒流形的有限体积爱因斯坦扭曲积结构，并探讨了其在相对论理论中的应用。
Envelopes of the Thurston metric on Teichmüller space
本文研究Teichmüller空间上Thurston度量的包络性质，通过谐波拉伸线定义包络结构，并探讨其连续性和可缩性，同时扩展到无限度量包络并提出新的特征化方法。
A normalized Ricci flow on surfaces with boundary towards the complete hyperbolic metric
本文研究带边界二维紧致曲面上给定边界测地曲率的归一化 Ricci 流，证明一大类初边值问题全局唯一存在并收敛到完备双曲度量，同时给出不收敛的边界数据反例。
A New Riemannian Setting for Surface Registration
提出一种基于Sobolev型度量的内度量方法，直接定义在变形向量场上，用于黎曼设定下的正则曲面匹配，并与微分同胚匹配框架进行比较，通过有限元离散化测地线方程并计算代价泛函梯度。
We study the volume functional on the space of constant scalar curvature metrics with a prescribed boundary metric. We derive a sufficient and necessary condition for a metric to be a critical point, and show that the only domains in space forms, on which the standard metrics are critical points, are geodesic balls. In the zero scalar curvature case, assuming the boundary can be isometrically embedded in the Euclidean space as a compact strictly convex hypersurface, we show that the volume of a critical point is always no less than the Euclidean volume bounded by the isometric embedding of the…
We consider quasifuchsian manifolds with "particles", i.e., cone singularities of fixed angle less than $π$ going from one connected component of the boundary at infinity to the other. Each connected component of the boundary at infinity is then endowed with a conformal structure marked by the endpoints of the particles. We prove that this defines a homeomorphism from the space of quasifuchsian metrics with $n$ particles (of fixed angle) and the product of two copies of the Teichmüller space of a surface with $n$ marked points. This is analoguous to the Bers theorem in the non-singular case. Q…
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