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arXiv 2107.02634gr-qchep-th
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引力多极重整化

Gravitational Multipole Renormalization

Gabriel Luz Almeida, Stefano Foffa, Riccardo Sturani

AI总结:

本文计算引力辐射在静态曲率背景上散射的尾巴及尾巴之尾效应至牛顿常数二阶,发现并重整化紫外发散,首次给出一般磁多极的对数项。

摘要:

我们计算了引力辐射在静态背景曲率上散射的效应,精确到牛顿常数的二阶,这在文献中被称为尾巴和尾巴之尾过程,适用于一般的电多极和磁多极。从复合致密天体的多极展开出发,并且正如已知的电四极情形所预期的那样,我们遇到了长距离和短距离(紫外)发散。前者在正确定义的观测量中消失,后者被重整化,其相关的对数产生经典的重整化群流。紫外发散警示了复合源多极描述的不完备性,并且预期在紫外完备的理论中不会出现,正如文献中针对保守动力学情形所明确推导的那样。本文首次计算了与一般磁多极相关的尾巴之尾过程中的对数项。

英文摘要:

We compute the effect of scattering gravitational radiation off the static background curvature, up to second order in Newton constant, known in literature as tail and tail-of-tail processes, for generic electric and magnetic multipoles. Starting from the multipole expansion of composite compact objects, and as expected due to the known electric quadrupole case, both long- and short-distance (UV) divergences are encountered. The former disappears from properly defined observables, the latter are renormalized and their associated logarithms give rise to a classical renormalization group flow. UV divergences alert for incompleteness of the multipolar description of the composite source, and are expected not to be present in a UV-complete theory, as explicitly derived in literature for the case of conservative dynamics. Logarithmic terms from tail-of-tail processes associated to generic magnetic multipoles are computed in this work for the first time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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