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On the angular momentum of compact binary coalescence

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Communications in Theoretical Physics 2023年第4期75卷 78-86页

作者： Xiaokai He Xiaoning Wu naqing xie School of Mathematics and Statistics Hunan First Normal UniversityChangsha 410205China Institute of Mathematics Academy of Mathematics and Systems Science and Hua Loo-Keng Key LaboratoryChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences Fudan UniversityShanghai 200433China

The supertranslation ambiguity issue of angular momentum is a long-standing problem in general ***,there appeared the first definition of angular momentum at null infinity that is supertranslation ***,in the compact binary coalescence community,supertranslation ambiguity is often *** paper demonstrates that we have the happy circumstance that the newly defined angular momentum coincides with the classical definition at the quadrupole level.

关键词： gravitational wave angular momentum compact binary coalescence

Uniqueness of the Reissner-Nordstrom metric near the null infinity

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Science China Mathematics 2024年第8期67卷 1933-1956页

作者： Xiaokai He Xiaoning Wu naqing xie School of Mathematics and Statistics Hunan First Normal UniversityChangsha 410205China Institute of Mathematics Academy of Mathematics and Systems Science and Hua Loo-Keng Key Laboratory of MathematicsChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences Fudan UniversityShanghai 200433China

In the Newman-Penrose formalism,we prove that the Reissner-Nordstrom metric is the only asymptotically fat,static,axially symmetric,Petrov type-D analytic solution of the electro-vacuum Einstein-Maxwell equations near... 详细信息

关键词： uniqueness theorem Reissner-Nordstrom metric Newman-Penrose formalism

On limit behavior of quasi-local mass for ellipsoids at spatial infinity

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Communications in Theoretical Physics 2020年第1期72卷 102-110页

作者： Xiaokai He Leong-Fai Wong naqing xie School of Mathematics and Computational Science Hunan First Normal UniversityChangsha 410205China School of Mathematical Sciences Fudan UniversityShanghai 200433China

We discuss the spatial limit of the quasi-local mass for certain ellipsoids in an asymptotically flat static spherically symmetric *** ellipsoids are not nearly round but they are of interest as an admissible parametrized foliation defining the Arnowitt–Deser–Misner *** Hawking mass of this family of ellipsoids tends to-∞.In contrast,we show that the Hayward mass converges to a finite ***,a positive mass type theorem is *** limit of the mass has a uniform positive lower bound no matter how oblate these ellipsoids *** result could be extended for asymptotically Schwarzschild *** numerical simulation in the Schwarzschild spacetime illustrates that the Hayward mass is monotonically increasing near infinity.

关键词： quasi-local mass asymptotically flat limit behavior

Hyperbolic positive mass theorem under modified energy condition

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Science China Mathematics 2008年第12期51卷 2189-2197页

作者： xie naqing Institute of Mathematics, School of Mathematical Sciences, Fudan University, Shanghai 200433, China Institute of Mathematics School of Mathematical Sciences Fudan University Shanghai 200433 China

We provide two new positive mass theorems under respective modified energy conditions allowing T00 negative on some compact set for certain modified asymptotically hyperbolic manifolds. This work is analogous to Zhang... 详细信息

关键词： positive mass theorem modified energy condition modified asymptotically hyperbolic 83C40 53C27

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非球对称情形箍猜想若干进展

中国科学：数学 2018年第6期48卷 835-842页

作者：谢纳庆复旦大学数学科学学院上海200433

本文简要地介绍了本文作者及其合作者最近几年在非球对称情形箍猜想研究方面的若干进展.

关键词：箍猜想陷俘面准局域质量

GEOMETRIC INEQUALITIES FOR CERTAIN SUBMANIFOLDS IN A PINCHED RIEMANNIAN MANIFOLD

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Acta Mathematica Scientia 2007年第3期27卷 611-618页

作者：谢纳庆许洪伟 Institute of Mathematics Fudan University Center of Mathematical Sciences Zhejiang University

This article gives some geometric inequalities for a submanifold with parallel second fundamental form in a pinched Riemannian manifold and the distribution for the square norm of its second fundamental form.

关键词： Submanifolds second fundamental form pinched Riemannian manifold

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不同产地米槁根际菌群多样性及其影响因素

西北林学院学报 2023年第2期38卷 185-192页

作者：吴婷婷黄路婷谢元贵刘济明田秀廖小锋贵州大学林学院贵州贵阳550025 贵州科学院贵州贵阳550001

以贵州省黔西南、黔南州3个产地(BP、LD、XL)的米槁根际土壤为研究对象,采用纯培养手段对米槁根际真菌进行纯化培养,探讨米槁根际土壤可培养真菌多样性和分离潜力,为后期促生真菌的筛选和功能验证提供基础依据。结果表明,从不同产地米... 详细信息

以贵州省黔西南、黔南州3个产地(BP、LD、XL)的米槁根际土壤为研究对象,采用纯培养手段对米槁根际真菌进行纯化培养,探讨米槁根际土壤可培养真菌多样性和分离潜力,为后期促生真菌的筛选和功能验证提供基础依据。结果表明,从不同产地米槁根际土壤中共分离到真菌367株,鉴定为3门5纲17目38科57属。木霉属Trichoderma是3产地共有的优势属,占总菌株的20.98%。BP、LD和XL的共有属有9种且木霉属是BP(22.6%)和LD(27.3%)的绝对优势属,XL的绝对优势属为青霉菌属(16.7%)。在属水平上,BP的菌群多样性和丰富度最高,LD的菌群多样性最低,但其均匀度最高。不同产地米槁根际菌群的组成不同,其中除BP与XL之间中等不相似,其余产地间极不相似。菌群多样性与土壤化学性质及酶活性存在显著相关性,全氮、速效氮、有效钾和蔗糖酶活性是影响米槁根际菌群多样性的关键因子。

关键词：米槁根际可培养真菌菌群多样性土壤因子