Cosmology with Love: Measuring the Hubble constant using neutron star universal relations
Cosmology with Love: Measuring the Hubble constant using neutron star universal relations
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DOI：
10.1103/physrevd.104.083528
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发表时间：
2021-06
影响因子：
5
通讯作者：
D. Chatterjee;Abhishek Hegade K. R.-Abhishek-Hegade-K. R.-2133943042;G. Holder;D. Holz;S. Perkins;Kent Yagi;N. Yunes
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文献类型：
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作者：
D. Chatterjee;Abhishek Hegade K. R.-Abhishek-Hegade-K. R.-2133943042;G. Holder;D. Holz;S. Perkins;Kent Yagi;N. Yunes
引力波宇宙学始于2017年，当时观测到两颗中子星合并时发出的引力波，以及随后对电磁辐射的同步观测。虽然哈勃常数的测量值只有30美元，但未来的观测可能会通过其他重合事件或通过引力波事件与星系目录的交叉相关产生更精确的测量值。在这里，我们实现了一种新的方法来测量哈勃常数没有电磁对应物，并通过使用的二元洛夫关系。这些关系以状态方程不敏感的方式支配中子星的潮汐形变。重要的是，洛夫关系取决于源帧中二元体的分量质量。由于引力波的相位和振幅取决于观测者坐标系中的啁啾质量（因此也就是红移），因此原则上可以将引力波数据与双星洛夫关系联合收割机结合起来直接测量红移，从而推断出哈勃常数的值。我们实现这种方法在真实的和合成数据，通过贝叶斯参数估计研究在一系列的观察方案。我们发现，对于LIGO/Virgo/KAGRA设计灵敏度时代，这种方法导致哈勃常数的测量精度与当前的暗警报器测量精度相似。对于第三代探测器，当结合LIGO Voyager时代的二元中子星星事件的测量时，这种精度提高到$\lesssim 10\%$，在宇宙探测器时代提高到$\lesssim 2\%$。
Gravitational-wave cosmology began in 2017 with the observation of the gravitational waves emitted in the merger of two neutron stars, and the coincident observation of the electromagnetic emission that followed. Although only a $30\%$ measurement of the Hubble constant was achieved, future observations may yield more precise measurements either through other coincident events or through cross correlation of gravitational-wave events with galaxy catalogs. Here, we implement a new way to measure the Hubble constant without an electromagnetic counterpart and through the use of the binary Love relations. These relations govern the tidal deformabilities of neutron stars in an equation-of-state insensitive way. Importantly, the Love relations depend on the component masses of the binary in the source frame. Since the gravitational-wave phase and amplitude depend on the chirp mass in the observer (and hence redshifted) frame, one can in principle combine the binary Love relations with the gravitational-wave data to directly measure the redshift, and thereby infer the value of the Hubble constant. We implement this approach in both real and synthetic data through a Bayesian parameter estimation study in a range of observing scenarios. We find that for the LIGO/Virgo/KAGRA design sensitivity era, this method results in a similar measurement accuracy of the Hubble constant to those of current-day, dark-siren measurements. For third generation detectors, this accuracy improves to $\lesssim 10\%$ when combining measurements from binary neutron star events in the LIGO Voyager era, and to $\lesssim 2\%$ in the Cosmic Explorer era.