Pseudotensors and quasilocal energy-momentum
Pseudotensors and quasilocal energy-momentum
复制标题
DOI：
10.1103/physrevlett.83.1897
复制
发表时间：
1998-09
影响因子：
8.6
通讯作者：
C. C. Chang-C.;J. M. Nester;C. M. Chen
中科院分区：
文献类型：
--
作者：
C. C. Chang-C.;J. M. Nester;C. M. Chen
早期对引力系统的能量-动量研究给出了依赖于参考系的赝张量;后来发展了准定域的概念。准定域能量-动量可以由哈密顿边界项确定，它也确定了在边界上保持固定的变量。我们证明了一个伪张量对应于一个哈密顿边界项。因此，它们是准定域的和可接受的;每一个都是具有一定边界条件的确定物理情形的能量-动量密度。这些条件被确定为众所周知的pseudotensors。
Early energy-momentum investigations for gravitating systems gave reference frame dependent pseudotensors; later the quasilocal idea was developed. Quasilocal energy-momentum can be determined by the Hamiltonian boundary term, which also identifies the variables to be held fixed on the boundary. We show that a pseudotensor corresponds to a Hamiltonian boundary term. Hence they are quasilocal and acceptable; each is the energy-momentum density for a definite physical situation with certain boundary conditions. These conditions are identified for well-known pseudotensors.