用二元共振在引力波景观中桥接$μ$ Hz间隙
Bridging the $μ$Hz gap in the gravitational-wave landscape with binary resonance
摘要：
引力波（GW）天文学正在通过探测电磁观测站不可见的现象来改变我们对宇宙的理解。对GW频谱的全面探索对于充分利用这一潜力至关重要。值得注意的是，目前的方法几乎没有触及$μ$ Hz频带。在这里，我们表明，这$μ$赫兹的差距可以通过搜索的偏差所造成的共振相互作用与GW的二进制系统的轨道填充。特别是，我们表明，激光测距的月球和人造卫星在地球周围，以及时间的二进制卫星，可能会发现第一GW信号在这个波段，或以其他方式设置严格的新的限制。为了说明这些二元共振搜索的发现潜力，我们考虑了来自宇宙学一级相变的GW信号，这表明我们的方法将探测任何其他近期GW任务都无法访问的早期宇宙模型。我们还讨论了我们的方法如何揭示NANOGrav检测到的可能的GW信号，要么限制其光谱特性，要么甚至给出独立的确认。
英文摘要：
Gravitational-wave (GW) astronomy is transforming our understanding of the Universe by probing phenomena invisible to electromagnetic observatories. A comprehensive exploration of the GW frequency spectrum is essential to fully harness this potential. Remarkably, current methods have left the $μ$Hz frequency band almost untouched. Here, we show that this $μ$Hz gap can be filled by searching for deviations in the orbits of binary systems caused by their resonant interaction with GWs. In particular, we show that laser ranging of the Moon and artificial satellites around the Earth, as well as timing of binary pulsars, may discover the first GW signals in this band, or otherwise set stringent new constraints. To illustrate the discovery potential of these binary resonance searches, we consider the GW signal from a cosmological first-order phase transition, showing that our methods will probe models of the early Universe that are inaccessible to any other near-future GW mission. We also discuss how our methods can shed light on the possible GW signal detected by NANOGrav, either constraining its spectral properties or even giving an independent confirmation.
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