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arXiv 2007.14279gr-qchep-thmath-phmath.MP
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Bowen-York模型解Redux

Bowen-York Model Solution Redux

Emel Altas, Bayram Tekin

摘要:

广义相对论中的初值问题通常用数值方法求解,只有少数例外,其中之一是Bowen和York的“模型”解,其中有解的解析形式。该解描述了一个动态的、时间非对称的、具有质量和线性动量的引力系统。在这里,我们重新审视这个解决方案,并纠正一个错误,原来是重要的,确定的解决方案的能量含量。取决于线性动量,初始能量的非平稳部分与总ADM能量的比率取$[0, 0.592)$之间的值。这个非静止的部分预计将在系统演化过程中转变为引力波,并可能沉降为具有质量和线性动量的黑洞。在超相对论的情况下(高动量极限),引力波能量的最大值是总ADM能量的$59.2 \%$。我们也给出了详细的说明的一般解决方案的哈密顿约束。

英文摘要:

Initial value problem in General Relativity is often solved numerically; with only a few exceptions one of which is the "model" solution of Bowen and York where an analytical form of the solution is available. The solution describes a dynamical, time-asymmetric, gravitating system with mass and linear momentum. Here we revisit this solution and correct an error which turns out to be important for identifying the energy-content of the solution. Depending on the linear momentum, the ratio of the non-stationary part of the initial energy to the total ADM energy takes values between $[0, 0.592)$. This non-stationary part is expected to be turned into gravitational waves during the evolution of the system to possibly settle down to a black hole with mass and linear momentum. In the ultra-relativistic case (the high momentum limit), the maximum amount of gravitational wave energy is $59.2 \%$ of the total ADM energy. We also give a detailed account of the general solution of the Hamiltonian constraint.

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