Remarks on Definitions of Perturbation in General Relativity

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	Remarks on Definitions of Perturbation in General Relativity
	He Ping; He, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100080, Peoples R China
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2009
卷号	51 期号:2 页码:375-377
关键词	Cosmological Perturbations Gauge Transformations Invariance 2nd-order Spacetime Universe
ISSN号	0253-6102
英文摘要	There are two kinds of definitions of perturbation of physical quantities in the framework of general relativity: one is direct, the other is geometrical. Correspondingly, there are two types of gauge transformation related with these two definitions. The passive approach is based on the property of general covariance, and the active one is through the action of Lie-derivative. Although under a proper coordinate choice, the two approaches seem to agree with each other, they are different in nature. The geometrical definition of relativistic perturbation and the active approach for gauge transformation are more rigorous in mathematics and less confusing in physical explanation. The direct definition, however, seems to be plagued with difficulties in physical meaning, and the passive approach is more awkward to use, especially for high-order gauge transformations.
学科主题	Physics
WOS记录号	WOS:000263891900037
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5397]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	He, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	He Ping,He, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100080, Peoples R China. Remarks on Definitions of Perturbation in General Relativity[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2009,51(2):375-377.
APA	He Ping,&He, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100080, Peoples R China.(2009).Remarks on Definitions of Perturbation in General Relativity.COMMUNICATIONS IN THEORETICAL PHYSICS,51(2),375-377.
MLA	He Ping,et al."Remarks on Definitions of Perturbation in General Relativity".COMMUNICATIONS IN THEORETICAL PHYSICS 51.2(2009):375-377.