Dynamics of Compact, Extended Celestial Bodies in Strong Gravitational Fields

强引力场中致密、扩展天体的动力学

• 批准号: 9207902
• 负责人: Kenneth Nordtvedt
• 金额: $ 7.5万
• 依托单位: Montana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-01 至 1996-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9207902&HistoricalAwards=false
• 关键词: Dynamics; Compact; Extended; Celestial; Bodies

Celestial bodies possess a fraction of their own mass which results from their internal gravitational binding, and celestial bodies have finite size (rather than being point- bodies). Such bodies undergo their most revealing motions when located in the strong gravitational fields close to black holes or other highly compact bodies. The equations of motion of such bodies when located in the strong gravity environment will be calculated from first principles, both in general relativity theory and in alternative theories. Perturbation theory will be applied to the exact, strong field Schwarzschild environment, rather than working with the perturbations to the empty space Minkowski environment of the classic studies of this problem of motion. Direct application of the results of these calculations can be made to interpreting the results of present-day radio telescope observations of pulsars, and to near-future efforts to detect and understand gravity wave signals from the cosmos.

天体拥有其自身质量的一小部分，这是由于它们内部的引力作用，而且天体的大小是有限的（而不是点状天体）。当这些天体位于靠近黑洞或其他高度致密天体的强引力场中时，它们的运动最为明显。这些物体在强重力环境下的运动方程将从广义相对论和替代理论中的第一性原理计算出来。将微扰理论应用于精确的、强场的史瓦西环境中，而不是用微扰来研究真空闵可夫斯基环境中的这一经典运动问题。这些计算的结果可以直接应用于解释目前射电望远镜对脉冲星的观测结果，以及在不久的将来探测和理解来自宇宙的重力波信号的努力。