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arXiv 2311.03474gr-qcastro-ph.COastro-ph.EPastro-ph.IM
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利用太阳系天体测量观测引力波

Observing gravitational waves with solar system astrometry

Giorgio Mentasti, Carlo R. Contaldi

AI总结:

本文计算了各向同性随机引力波背景对太阳系天体自行的天体测量信号,推导出偶极和四极相关模式,并估算了利用海量小行星观测可获得的振幅上限,凸显未来巡天的潜力。

摘要:

引力波对天体视位置的微妙影响提供了新颖的观测窗口。我们计算了在短距离极限下,由各向同性随机引力波背景(SGWB)所引发的预期天体测量信号。我们关注的重点是太阳系天体由此产生的自行运动,这一信号的时间尺度与脉冲星计时阵列(PTA)所研究的时间尺度相同。我们推导了相应的天体测量偏折模式,发现它们表现为独特的偶极和四极相关性,或在某些情况下可能不存在。我们的分析涵盖了爱因斯坦极化与非爱因斯坦极化。我们估算了尺度不变的SGWB振幅的上限,该上限可通过追踪大量太阳系天体(如小行星)的自行运动来获得。随着盖亚卫星和维拉·鲁宾天文台准备追踪数量从$O(10^5)$到$O(10^6)$不等的大量小行星样本,我们强调了类似巡天项目在未来为理解SGWB做出重大贡献的潜力。

英文摘要:

The subtle influence of gravitational waves on the apparent positioning of celestial bodies offers novel observational windows. We calculate the expected astrometric signal induced by an isotropic Stochastic Gravitational Wave Background (SGWB) in the short distance limit. Our focus is on the resultant proper motion of Solar System objects, a signal on the same time scales addressed by Pulsar Timing Arrays (PTA). We derive the corresponding astrometric deflection patterns, finding that they manifest as distinctive dipole and quadrupole correlations, or in some cases, may not be present. Our analysis encompasses both Einsteinian and non-Einsteinian polarisations. We estimate the upper limits for the amplitude of a scale-invariant SGWB that could be obtained by tracking the proper motions of large numbers of solar system objects such as asteroids. With the Gaia satellite and the Vera C. Rubin Observatory poised to track an extensive sample of asteroids-ranging from $O(10^5)$ to $O(10^6)$, we highlight the significant future potential for similar surveys to contribute to our understanding of the SGWB.

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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