Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany.
Nikhef, 1098 XG Amsterdam, Netherlands.
Science. 2020 Dec 18;370(6523):1450-1453. doi: 10.1126/science.abb4317.
Observations of neutron-star mergers with distinct messengers, including gravitational waves and electromagnetic signals, can be used to study the behavior of matter denser than an atomic nucleus and to measure the expansion rate of the Universe as quantified by the Hubble constant. We performed a joint analysis of the gravitational-wave event GW170817 with its electromagnetic counterparts AT2017gfo and GRB170817A, and the gravitational-wave event GW190425, both originating from neutron-star mergers. We combined these with previous measurements of pulsars using x-ray and radio observations, and nuclear-theory computations using chiral effective field theory, to constrain the neutron-star equation of state. We found that the radius of a 1.4-solar mass neutron star is [Formula: see text] km at 90% confidence and the Hubble constant is [Formula: see text] at 1σ uncertainty.
观测具有不同信使（包括引力波和电磁信号）的中子星合并，可以用来研究密度超过原子核的物质的行为，并测量宇宙的膨胀率，其由哈勃常数定量表示。我们对引力波事件 GW170817 及其电磁对应体 AT2017gfo 和 GRB170817A 进行了联合分析，这两个事件均源自中子星合并，还对引力波事件 GW190425 进行了联合分析。我们将这些与以前使用 X 射线和无线电观测测量脉冲星的结果以及使用手征有效场理论进行的核理论计算相结合，来限制中子星的物态方程。我们发现，在 90%置信度下，一个 1.4 倍太阳质量的中子星的半径为[Formula: see text]km，哈勃常数在 1σ 不确定度下为[Formula: see text]。
