狭义相对论数学基础的探讨

狭义相对论的变革点就是相对时空观,而相对论时空与非欧几何学有着密切的联系.在介绍了传统的Minkowski空间后,引入双曲虚单位,其所构造的双曲复数对应双曲Minkowski复空间.利用双曲Minkowski空间复数运算规则,可以使高速运动客体的物理规律与复数的性质结合起来,为解决狭义相对论的普遍形式提供新的数学工具.     

非紧致一秩对称空间上某种极大函数的可和性

ＮｏěｌＬｏｈｏｕé证明了复对称空间上某种极大函数ｆ＋（ｘ）＝ｓｕｐｔ＞０（１＋ｔ）３２｜Ｐｔｆ（ｘ）｜的可和性可归结为‖（Δ０）１２ｆ‖（ｘ）的可和性．作者证明了上述结果对奇数维实双曲空间成立．由于偶数维实双曲空间的热核表达式不同，因此有必要对偶数维实双曲空间的情形单独给出证明．本文的目的就是证明上述结果对偶数维实双曲空间亦成立．     

复Clifford分析中的双曲调和函数

将多元复分析中一种复偏微分方程组的解与复Clifford分析中双曲调和函数联系起来,并研究了双曲调和函数的几个性质。     

关于3维负曲率流形的拓扑型

本文的主要定理是:对每一个正数V,存在一个D>0,如果一个3维黎曼流形M的体积小于V,截面曲率在-1和0之间,而且直径大于D,那么M允许一个双曲结构。     

复双曲空间中具有常主曲率的实超曲面

设Ｍ是２维复双曲空间ＣＨ＾２中的具有三个不同常数主曲率的实超曲面，则Ｍ满足下列之一：（１）其中有两个主曲率之间的差界于０和１之间；（２）三个主曲率形成一个公差是１的等差数列；（３）Ｍ全纯重合于二维实双曲空间上的一个管子。     

复空间之间的逆紧全纯映照

本文首先回顾单位圆盘到复平面之间不存在逆紧全纯映照的证明,然后给出这一经典结果在高维情形下的推广,例如,在n维全纯可分离流形的一个相对紧域到Cn之间不存在逆紧全纯映照.本文还研究复空间的某些解析性质在逆紧全纯映照下保持不变,如双曲性、测度双曲性、有界全纯函数的存在性及有界多次调和函数的存在性等.     

多复变数的Cauchy型积分(Ⅱ)Lie球双曲空间的Cauchy型积分

<正> §2.1.引言Lie 球双曲空间■(以下记为■),由满足■的 N(≥2)个复元素矢量 z=(z_1,z_2,…,z_N)所构成.■的边界,记为■,特別地,以(■表示■的特征流形.此外,N(≥2)个复变数 z_1,…,z_N 空间中的域■,     

复双曲空间中的曲率齐性实超曲面

本文讨论了复双曲空间中的连通定向实超曲面M的一些性质,利用正交标架法的建立,证明了在适当条件下,M等参与M具有常主曲率等价,M等参与M曲率齐性等价.     

典型域的调和函数论(Ⅲ)——斜对称方阵双曲空间的调和函数

<正> 3.1.斜对称方阵双曲空间的调和函数 命 Z 代表 n×n 斜对称方阵(?)(?)个复变数 z_(12),z_(13),…z_(1n),z_(23),…,(?)…,z_(n-1,n)空间的域我们引进运算子     

多复变数的Cauchy型积分(Ⅲ)矩阵双曲空间的Cauchy型积分

<正> §3.1.引言(m,n)表示矩阵双曲空间:(?)表示空间:(?)Z 是 m 行 n 列(不妨设 m≤n)复元素矩阵.华罗庚指出:如果甲(?)(U)在(m,n)的特征流形(?)上连续,则(?)的 Cauchy 型积分     

Hyperbolic Hilbert space

The hyperbolic complex space is one class of non-Euclidean spaces with continuous singular points. It corresponds with Minkowski space, and it has the characteristic that the space-time direction is different in nature. Regard the hyperbolic complex space as original spaces. We can abstract a class of the hyperbolic inner product space and the hyperbolic Hilbert space.     

Stability of complex hyperbolic space under curvature-normalized Ricci flow

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.     

The moduli space of hyperbolic compact complex spaces

In this paper, we construct the moduli space of reduced hyperbolic compact complex spaces. First, we prove an infinitesimal characterization of hyperbolicity using a family of Kobayashi–Royden pseudo-metrics introduced by Venturini and as a consequence we conclude that the property of Landau holds for complex spaces. Finally, we establish this moduli space in the case of locally trivial deformations, and in a more general situation, the case of equisingular deformations.     

Krasnoselskii's iteration process in hyperbolic space

A well-known iteration scheme due to Krasnoselskii for approximation of fixed points of nonexpansive mappings in Banach spaces is extended to a wider class of spaces. This class includes convex metric spaces of ‘hyperbolic’ type, and the results apply to the study of holomorphic self-mappings of the unit ball in complex Hilbert space.     

Triangulations and Volume Form on Moduli Spaces of Flat Surfaces

In this paper, we study the moduli spaces of flat surfaces with cone singularities verifying the following property: there exists a union of disjoint geodesic tree on the surface such that the complement is a translation surface. Those spaces can be viewed as deformations of the moduli spaces of translation surfaces in the space of flat surfaces. We prove that such spaces are quotients of flat complex affine manifolds by a group acting properly discontinuously, and preserving a parallel volume form. Translation surfaces can be considered as a special case of flat surfaces with erasing forest, in this case, it turns out that our volume form coincides with the usual volume form (which are defined via the period mapping) up to a multiplicative constant. We also prove similar results for the moduli space of flat metric structures on the n-punctured sphere with prescribed cone angles up to homothety. When all the angles are smaller than 2π, it is known (cf. [T]) that this moduli space is a complex hyperbolic orbifold. In this particular case, we prove that our volume form induces a volume form which is equal to the complex hyperbolic volume form up to a multiplicative constant.     

Standard position for objects in hyperbolic space

It is shown that, by applying hyperbolic isometries, one may arrangen points in hyperbolic (n–1)-space in a certain standard position. Similar results are developed for complex hyperbolic space, as well as hyperbolic spaces defined over nearly arbitrary fields. The algebraic basis of the paper is the determination of the structure of a double coset space which occurs in representation theory.Partially supported by NSA grant # MDA-904-96-0018.Partially supported by NSA grant # MDA904-95-1-1089.     

An extension of Calabi's rigidity theorem to complex submanifolds of indefinite complex space forms

The rigidity for full holomorphic isometric immersions of an indefinite Kähler manifold into an indefinite complex space form is proved. All such immersions between indefinite complex projective (and hyperbolic) spaces are founded and examples of non-congruents holomorphic isometric immersions are exposed.     

Superrigidity of Hyperbolic Buildings

In this paper, we study the behavior of harmonic maps into complexes with branching differentiable manifold structure. The main examples of such target spaces are Euclidean and hyperbolic buildings. We show that a harmonic map from an irreducible symmetric space of noncompact type other than real or complex hyperbolic into these complexes are non-branching. As an application, we prove rank-one and higher-rank superrigidity for the isometry groups of a class of complexes which includes hyperbolic buildings as a special case.