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arXiv 2108.11248hep-thgr-qc
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后闵可夫斯基引力理论中有效单体形式的重构

Remodeling the Effective One-Body Formalism in Post-Minkowskian Gravity

Poul H. Damgaard, Pierre Vanhove

摘要:

根据最近的散射振幅计算,重新考虑了广义相对论中引力二体问题的有效单体形式。基于动量和有效势之间的运动学关系,我们考虑了一个能量依赖的有效度规,它描述了约化质量的有效单体问题的散射。在各向同性坐标系中,当与重新定义的角动量图相结合时,有效度量的识别大大简化。虽然预期的有效能量依赖度规不是唯一的,但在后闵可夫斯基展开中可以微扰地选择解,而不需要引入非度规修正。通过正则变换,我们的条件映射到基于标准角动量映射的条件。扩大我们的度量周围的史瓦西解决方案,我们恢复解决方案的基础上额外的非度量的贡献。

英文摘要:

The Effective One-Body formalism of the gravitational two-body problem in general relativity is reconsidered in the light of recent scattering amplitude calculations. Based on the kinematic relationship between momenta and the effective potential, we consider an energy-dependent effective metric describing the scattering in terms of an Effective One-Body problem for the reduced mass. The identification of the effective metric simplifies considerably in isotropic coordinates when combined with a redefined angular momentum map. While the effective energy-dependent metric as expected is not unique, solutions can be chosen perturbatively in the Post-Minkowskian expansion without the need to introduce non-metric corrections. By a canonical transformation, our condition maps to the one based on the standard angular momentum map. Expanding our metric around the Schwarzschild solution we recover the solution based on additional non-metric contributions.

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