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arXiv 2110.02243gr-qc
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四阶后牛顿紧双星的四极矩:II。维数正则化与重正化

The Quadrupole Moment of Compact Binaries to the Fourth post-Newtonian Order: II. Dimensional Regularization and Renormalization

François Larrouturou, Luc Blanchet, Quentin Henry, Guillaume Faye

摘要:

在广义相对论的四阶后牛顿近似下,研究了无自旋的螺旋型致密双星辐射质量型四极矩的正则化和重整化.从保守的4PN运动方程中可以清楚地看出,为了正确地处理引力波在向未来的零无穷远传播过程中所经历的非线性相互作用,必须实现维数正则化。通过实施这样的程序,我们表明,来自源的时刻(计算在同伴文件)的极点是完全取消的辐射时刻,预期的物理量。因此,我们定义并获得了一个“重整化”源四极,三维的性质,这是一个重要的一步计算的引力波通量与4PN精度。此外,我们明确证明了之间的等价性的维正则化和以前使用的Hadamard partie finie计划的3PN顺序。

英文摘要:

The regularization and renormalization of the radiative mass-type quadrupole moment of inspiralling compact binaries (without spins) is investigated at the fourth post-Newtonian (4PN) approximation of general relativity. As clear from the conservative 4PN equations of motion, a dimensional regularization has to be implemented in order to properly treat the non-linear interactions experienced by gravitational waves during their propagation toward future null infinity. By implementing such procedure, we show that the poles coming from the source moment (computed in a companion paper) are exactly cancelled in the radiative moment, as expected for a physical quantity. We thus define and obtain a "renormalized" source quadrupole, three-dimensional by nature, which is an important step towards the computation of the gravitational-wave flux with 4PN accuracy. Furthermore, we explicitly prove the equivalence between the dimensional regularization and the previously used Hadamard partie finie scheme up to the 3PN order.

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