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arXiv 2102.08339gr-qchep-th
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后闵可夫斯基有效场论中的引力韧致辐射

Gravitational Bremsstrahlung in the Post-Minkowskian Effective Field Theory

Stavros Mougiakakos, Massimiliano Maria Riva, Filippo Vernizzi

摘要:

利用后闵可夫斯基有效场论方法研究了两个无自旋物体散射时的引力辐射。在牛顿常数$G$中,我们导出了与引力线性耦合的守恒应力能量张量和首阶和次首阶引力子发射的经典几率幅。振幅可以用紧凑的形式表示为涉及贝塞尔函数的费曼参数上的一维积分。我们用它来恢复的领先阶辐射角动量的表达。在两个机构之间的相对速度$v$展开后,我们计算了总的四个动量辐射到引力波在领先的顺序$G$和$v^8$,发现最近使用散射振幅方法计算的协议。我们的研究结果也使我们能够调查的零频率限制的发射能谱。

英文摘要:

We study the gravitational radiation emitted during the scattering of two spinless bodies in the post-Minkowskian Effective Field Theory approach. We derive the conserved stress-energy tensor linearly coupled to gravity and the classical probability amplitude of graviton emission at leading and next-to-leading order in the Newton's constant $G$. The amplitude can be expressed in compact form as one-dimensional integrals over a Feynman parameter involving Bessel functions. We use it to recover the leading-order radiated angular momentum expression. Upon expanding it in the relative velocity between the two bodies $v$, we compute the total four-momentum radiated into gravitational waves at leading-order in $G$ and up to an order $v^8$, finding agreement with what was recently computed using scattering amplitude methods. Our results also allow us to investigate the zero frequency limit of the emitted energy spectrum.

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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