论文标题
用丽莎测量重力波的传播速度
Measuring the propagation speed of gravitational waves with LISA
论文作者
论文摘要
在二进制中子星合并GW170817及其电磁对应物的假设下，引力波的传播速度（$ c_t $）受到了二进制中子星级合并的限制。根据有效的现场理论和量子重力的论点，我们讨论了一般相对性的修改允许从频率低于当前基于地面检测器的频段的光速$ c_t $的瞬时偏差的可能性。我们激励两个代表性的Ansätze，以$ C_T（F）$，并研究了它们对Lisa Mission可检测到的大型黑洞二进制合并的重力波形的影响。我们预测从Inspiral和Full Inspiral-Merger-Ringdown波形从单个系统和一系列来源获得的$ C_T（f）$上的约束。我们表明，丽莎将使我们能够在未开发的低频制度中与一般相对论的偏离，即使在没有电磁对应物的情况下也是如此。
The propagation speed of gravitational waves, $c_T$, has been tightly constrained by the binary neutron star merger GW170817 and its electromagnetic counterpart, under the assumption of a frequency-independent $c_T$. Drawing upon arguments from Effective Field Theory and quantum gravity, we discuss the possibility that modifications of General Relativity allow for transient deviations of $c_T$ from the speed of light at frequencies well below the band of current ground-based detectors. We motivate two representative Ansätze for $c_T(f)$, and study their impact upon the gravitational waveforms of massive black hole binary mergers detectable by the LISA mission. We forecast the constraints on $c_T(f)$ obtainable from individual systems and a population of sources, from both inspiral and a full inspiral-merger-ringdown waveform. We show that LISA will enable us to place stringent independent bounds on departures from General Relativity in unexplored low-frequency regimes, even in the absence of an electromagnetic counterpart.
