Quasi-local energy and the choice of reference

NCU Institutional Repository > 理學院 > 物理學系 > 期刊論文 > Item 987654321/52953

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/52953

题名:	Quasi-local energy and the choice of reference
作者:	Liu,JL;Chen,CM;Nester,JM
贡献者:	物理學系
关键词:	GENERAL-RELATIVITY;GRAVITY THEORIES;MOMENTUM
日期:	2011
上传时间:	2012-06-11 10:51:25 (UTC+8)
出版者:	國立中央大學
摘要:	A quasi-local energy for Einstein's general relativity is defined by the value of the preferred boundary term in the covariant Hamiltonian formalism. The boundary term depends upon a choice of reference and a time-like displacement vector field (which can be associated with an observer) on the boundary of the region. Here, we analyze the spherical symmetric cases. For the obvious analytic choice of reference based on the metric components, we find that this technique gives the same quasi-local energy values using several standard coordinate systems and yet can give different values in some other coordinate systems. For the homogeneous-isotropic cosmologies, the energy can be non-positive, and one case which is actually flat space has a negative energy. As an alternative, we introduce a way to determine the choice of both the reference and displacement by extremizing the energy. This procedure gives the same value for the energy in different coordinate systems for the Schwarzschild space, and a non-negative value for the cosmological models, with zero energy for the dynamic cosmology which is actually Minkowski space. The time-like displacement vector comes out to be the dual mean curvature vector of the two-boundary.
關聯:	CLASSICAL AND QUANTUM GRAVITY
显示于类别:	[物理學系] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	320	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....