| DC 欄位 |
值 |
語言 |
| DC.contributor | 物理學系 | zh_TW |
| DC.creator | 何飛宏 | zh_TW |
| DC.creator | Fei-Hung Ho | en_US |
| dc.date.accessioned | 2003-7-24T07:39:07Z | |
| dc.date.available | 2003-7-24T07:39:07Z | |
| dc.date.issued | 2003 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=89222027 | |
| dc.contributor.department | 物理學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | Nester-Chen 準局域表示式在 Teleparallel 理論及廣義相對論中，可以使能量、動量、角動量及質心距的準局域化 (quasilocalization) 成為協變的 (covariant) ，而此篇論文要討論的是：Teleparallel理論中的準局域質心距，在Nester-Chen 準局域表示式裡佔有重要地位。 | zh_TW |
| dc.description.abstract | Asymptotically flat gravitating system have 10 conserved quantities associated with
Poincar´e symmetry, which lack proper local densities. It has been hoped that the
tetrad formulation and the related teleparallel equivalent of Einstein’s GR (TEGR,
aka GR{II}) could solve this longstanding gravitational energy-momentum localization
problem [23, 32, 33]. Quasilocal expressions are now favored. Earlier quasilocal GR{II}
investigations focused on energy-momentum [32, 33]. Recently our group considered
angular momentum and found that the popular expression (unlike our “covariantsymplectic”
one [5]) was not asymptotically locally Lorentz frame gauge invariant;
it gives the correct result but only in a certain frame [30]. The remaining Poincar´e
quantity, the center-of-mass moment, has been neglected. Obtaining the correct value
for this quantity is a quite severe requirement, hence a new discriminating test for
proposed expressions. We found (independent of the frame gauge choice) that the
GR{II} “covariant-symplectic” Hamiltonian-boundary-term quasilocal expression succeeds
while the usual expression does not give the desired center-of-mass moment.
None of the tetrad expressions gives the desired center-of-mass moment. We conclude
that the teleparallel formulation is definitely better than the tetrad formulation, and
the covariant-symplectic expressions are definitely better than the alternatives. We
also found however that GR{II} has no advantage over GR for energy localization. | en_US |
| DC.subject | asdf | zh_TW |
| DC.subject | sadf | en_US |
| DC.title | Teleparallel 理論中之準局域質心距 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | QUASILOCAL CENTER-OF-MASS FOR GR{II} | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |