检索结果-南通市图书馆

A regular MOG black hole's impact on shadows and gravitational weak lensing in the presence of a quintessence field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第8期76卷 91-102页

作者： Ahmad Al-Badawi Sanjar Shaymatov Mirzabek Alloqulov anzhong wang Department of Physics Al-Hussein Bin Talal UniversityPO Box:2071111Ma’anJordan Institute for Theoretical Physics and Cosmology Zhejiang University of TechnologyHangzhou 310023China Tashkent State Technical University Tashkent 100095Uzbekistan University of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan New Uzbekistan University Movarounnahr Street 1Tashkent 100000Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan GCAP-CASPER Physics DepartmentBaylor UniversityWacoTX 76798-7316United States of America

We investigate the impact of the modified gravity(MOG)field and the quintessence scalar field on horizon evolution,black hole(BH)shadow and the weak gravitational lensing around a static spherically symmetric *** first begin to write the BH metric associated with the MOG parameter and quintessence scalar *** then determine the BH shadow and obtain numerical solutions for the photon sphere and shadow *** show that the MOG(α)and the quintessence(c)parameters have a significant impact on the BH shadow and photon *** on the analysis,we further show that the combined effects of the MOG parameter and quintessence field can increase the values of BH shadow and photon sphere *** also obtain constraints on the BH parameters by applying the observational data of Sgr A^(★)and M87^(★).Finally,we consider the weak deflection angle of BH within the context of the Gauss-Bonnet theorem(GBT)and show that the combined effects of the MOG and quintessence parameters do make the value of the deflection angle increase,and find this remarkable property is in good agreement with the physical meaning of both parameters that can maintain the strong gravitational field in the surrounding environment of a BH.

关键词： modified gravity shadows gravitational weak lensing quintessence field

Nonexistence of quantum black and white hole horizons in an improved dynamic approach

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 56-73页

作者： Wen-Cong Gan Xiao-Mei Kuang Zhen-Hao Yang Yungui Gong anzhong wang Bin wang College of Physics and Communication Electronics Jiangxi Normal UniversityNanchang 330022China GCAP-CASPER Physics DepartmentBaylor UniversityWaco 76798-7316USA Institute for Theoretical Physics&Cosmology Zhejiang University of TechnologyHangzhou 310023China United Center for Gravitational Wave Physics(UCGWP) Zhejiang University of TechnologyHangzhou 310023China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China Department of Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

In this paper,we study the quantum geometric effects near the locations where classical black hole horizons used to appear in Einstein's classical theory,within the framework of an improved dynamic approach,in which the internal region of a black hole is modeled by the Kantowski-Sachs(KS)spacetime and the two polymerization parameters are functions of the phase space *** detailed analysis shows that the effects are so strong that black and white hole horizons of the effective quantum theory do not exist at all and instead are replaced by transition surfaces,across which the metric coefficients and their inverses are smooth and remain finite,as are the corresponding curvatures,including the Kretschmann *** surfaces always separate trapped regions from anti-trapped *** number of such surfaces is infinite,so the corresponding KS spacetimes become geodesically complete,and no black and white hole-like structures exist in this scheme.

关键词： canonical quantization loop quantum gravity quantum aspects of black holes

同方期刊数据库

Background Dynamics of Pre-inflationary Scenario in Brans-Dicke Loop Quantum Cosmology

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第10期71卷 1205-1218页

作者： Manabendra Sharma Tao Zhu anzhong wang Institute for Theoretical Physics and Cosmology Zhejiang University of TechnologyHangzhou310023China GCAP-CASPER Department of PhysicsBaylor UniversityWacoTX76798-7316USA

Recently the background independent nonperturbative quantization has been extended to various theories of gravity and the corresponding quantum effective cosmology has been derived, which provides us with necessary avenue to explore the pre-inflationary dynamics. Brans-Dicke(BD) loop quantum cosmology(LQC) is one of such theories whose effective background dynamics is considered in this article. Starting with a quantum bounce, we explore the pre-inflationary dynamics of a universe sourced by a scalar field with the Starobinsky potential in BD-LQC. Our study is based on the idea that though Einstein’s and Jordan’s frames are classically equivalent up to a conformal transformation in BD theory, this is no longer true after quantization. Taking the Jordan frame as the physical one we explore in detail the bouncing scenario which is followed by a phase of a slow roll inflation. The three phases of the evolution of the universe, namely, bouncing, transition from quantum bounce to classical universe, and the slow roll inflation, are noted for an initially kinetic energy dominated bounce. In addition, to be consistent with observations, we also identify the allowed phase space of initial conditions that would produce at least 60 e-folds of expansion during the slow roll inflation.

关键词： loop quantum cosmology Brans-Dicke theory inflation quantum bounce

Gauge invariant perturbations of general spherically symmetric spacetimes

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 141-154页

作者： Wentao Liu Xiongjun Fang Jiliang Jing anzhong wang Department of Physics Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of EducationSynergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China GCAP-CASPER Departmentof PhysicsBaylor UniversityWaco76798-7316USA

In this paper,the gauge choices in general spherically symmetric spacetimes are *** particular,we construct the gauge invariant variables and the master equations for both the Detweiler easy gauge and the Regge-Wheeler gauge,*** particular cases for l=0,1 are also *** results provide analytical calculations of metric perturbations in general spherically symmetric spacetimes,which can be applied to various cases,including the effective-one-body problem.A simple example is presented to show how the metric perturbation components are related to the source perturbation terms.

关键词： metric perturbation gauge invariant master equation

在线全文

学校读者我要写书评

暂无评论

民国时期高等工程教育实践模式探索

湖南师范大学教育科学学报 2017年第4期16卷 117-119页

作者：王安中湖南省社会科学院湖南长沙410003

民国时期中国高等工程教育得到了迅速发展,尤其是兵工高等教育在实践模式方面的探索卓有成效。经过一段时间的努力,不仅兵工教育的课程设置及教材得到进一步优化,师资力量也以专兼职结合的办法获得充实,学生的理论知识与实践操作实现了... 详细信息

民国时期中国高等工程教育得到了迅速发展,尤其是兵工高等教育在实践模式方面的探索卓有成效。经过一段时间的努力,不仅兵工教育的课程设置及教材得到进一步优化,师资力量也以专兼职结合的办法获得充实,学生的理论知识与实践操作实现了深度融合,从而为培养合格的兵工人才奠定了坚实基础。

关键词：兵工实践课程高等工程教育

理性地寻求突破——2006年中国动画片发展综述

在线全文

学校读者我要写书评

暂无评论

中国广播电视学刊 2007年第1期 20-20,17页

作者：王安中四川大学新闻与传播研究所

动画产业是文化产业极其重要的组成部分．是21世纪特具开发潜力的新兴产业和朝阳产业。2006年是中国动画片发展史上非同寻常的一年。这一年．国务院有关部门先后下发了6个与动画片直接相关的文件．特别是4月25日．国务院办公厅转发了九... 详细信息

动画产业是文化产业极其重要的组成部分．是21世纪特具开发潜力的新兴产业和朝阳产业。2006年是中国动画片发展史上非同寻常的一年。这一年．国务院有关部门先后下发了6个与动画片直接相关的文件．特别是4月25日．国务院办公厅转发了九部委《关于推动我国动漫产业发展若干意见》（以下简称《意见》）。《意见》正式将动漫产业列为高科技产业．明确界定了动漫产业的定义和产业特征．提出了推动整个动漫产业发展的指导思想，基本思路和发展目标．并且规定了促进动漫产业发展的财政支持、税收减免、电视播放市场、融资渠道、知识产权保护，国际合作等诸多政策。《意见》涵盖了动漫产业发展的方方面面．是促进我国动漫产业发展具有纲领性指导意义的重要文件。

关键词：中国动画片国务院办公厅动漫产业产业发展综述理性《意见》知识产权保护

在线全文

学校读者我要写书评

暂无评论

中国古代人物画长卷“拟影像性”研究

电影艺术 2007年第6期 39-43页

作者：王安中四川大学文学与新闻学院

中国古代人物画长卷狭长的幅面形制、表现内容、构图原则和移动式的阅读方式决定着它具有很强的时间特征,也因之形成了其独特的"拟影像性"艺术特点。考察并比较中国古代人物画长卷在视觉程式、视觉修辞区隔单元、宏大场面的处理方法和"... 详细信息

中国古代人物画长卷狭长的幅面形制、表现内容、构图原则和移动式的阅读方式决定着它具有很强的时间特征,也因之形成了其独特的"拟影像性"艺术特点。考察并比较中国古代人物画长卷在视觉程式、视觉修辞区隔单元、宏大场面的处理方法和"诗书画印"的协同关系对应于电影艺术在影像场面调度、影像"帧"、宏大场面的影像技巧和电影综合语言互补关系之间的类同性,可以初步总结出中国古代人物画长卷对电影镜语特色的借鉴价值。

关键词：中国古代人物画影像场面调度电影艺术表现内容时间特征阅读方式

在线全文

学校读者我要写书评

暂无评论

明代宫殉制度探究

历史教学问题 2010年第3期 28-35页

作者：朱子彦王安中上海大学历史学系

自朱元璋将殉葬制度定为祖制之后，便迅速推广开来，其范围之广，影响之深，为历朝所罕见。其盛行原因与元明时期大力推崇的贞节观有密切关系，而贞节观的出现主要受两方面因素的影响，一是宋明理学的盛行，二是统治者的教化。自土木堡... 详细信息

自朱元璋将殉葬制度定为祖制之后，便迅速推广开来，其范围之广，影响之深，为历朝所罕见。其盛行原因与元明时期大力推崇的贞节观有密切关系，而贞节观的出现主要受两方面因素的影响，一是宋明理学的盛行，二是统治者的教化。自土木堡之变以后，儒家礼教对女性的束缚有所松动，出现了一股批判传统妇女观的思潮，这为英宗废除宫殉打下了思想和社会基础。另一方面是英宗自身的性格原因，他特别看重夫妻之情。本文将运用社会心理学的方法，对英宗废弃宫殉作出更深层次的分析。

关键词：明初宫殉贞节观宫廷教化英宗心理

《论持久战》对西方经典战争理论的创新与超越

在线全文

学校读者我要写书评

暂无评论

毛泽东研究 2019年第6期 101-111页

作者：王安中湖南省社会科学院

《论持久战》作为世界军事理论史上的经典,充分吸收了人类军事科学的先进成果。毛泽东通过对马克思主义辩证法的充分运用,在东西方经典战争理论的基础上,针对中国特殊国情,不仅将对游击战的认识提高到了新的水平,而且在战争指导方针、... 详细信息

《论持久战》作为世界军事理论史上的经典,充分吸收了人类军事科学的先进成果。毛泽东通过对马克思主义辩证法的充分运用,在东西方经典战争理论的基础上,针对中国特殊国情,不仅将对游击战的认识提高到了新的水平,而且在战争指导方针、作战方式方面实现了创造性转化与创新性发展,为中国抗战力量的最大化挖掘与最优化整合进行了理论准备,探索了一条落后大国如何战胜军事强国的新道路,实现了对西方经典战争理论~①的创新与超越。

关键词：《论持久战》创新性发展创造性转化西方经典中国特殊国情军事强国指导方针马克思主义辩证法