English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 64745/64745 (100%)
造訪人次 : 20516198      線上人數 : 356
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/7290


    題名: Teleparallel 理論中之準局域質心距;QUASILOCAL CENTER-OF-MASS FOR GR{II}
    作者: 何飛宏;Fei-Hung Ho
    貢獻者: 物理研究所
    關鍵詞: asdf;sadf
    日期: 2003-06-27
    上傳時間: 2009-09-22 10:54:25 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 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。 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.
    顯示於類別:[物理研究所] 博碩士論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    0KbUnknown596檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋  - 隱私權政策聲明