Multimessenger constraints on the neutron-star equation of state and the Hubble constant
Multimessenger constraints on the neutron-star equation of state and the Hubble constant
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DOI：
10.1126/science.abb4317
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发表时间：
2020-12-18
期刊：
影响因子：
56.9
通讯作者：
Antier, Sarah
中科院分区：
文献类型：
--
作者：
Dietrich, Tim;Coughlin, Michael W.;Antier, Sarah
观测具有不同信使的中子星合并，包括引力波和电磁信号，可以用来研究比原子核密度更大的物质的行为，并测量由哈勃常数量化的宇宙膨胀率。我们对引力波事件GW170817和它的电磁对应物AT2017gfo和GRB170817A，以及引力波事件GW190425进行了联合分析，这两个事件都来自中子星合并。我们将这些与以前使用X射线和射电观测对脉冲星的测量，以及使用手征有效场理论的核理论计算相结合，以约束中子星状态方程。我们发现质量为1.4太阳的中子星在90%置信度下的半径为11.75(-0.81)(+0.86)公里，在1西格玛不确定度下的哈勃常数为66.2(-4.2)(+4.4)。
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 11.75(-0.81)(+0.86) km at 90% confidence and the Hubble constant is 66.2(-4.2)(+4.4) at 1 sigma uncertainty.