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首页> 外文期刊>The Astrophysical Journal. Letters >Thunder and Lightning: Using Neutron-star Mergers as Simultaneous Standard Candles and Sirens to Measure Cosmological Parameters
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Thunder and Lightning: Using Neutron-star Mergers as Simultaneous Standard Candles and Sirens to Measure Cosmological Parameters

机译：雷声和闪电：使用中子星相用作同时标准的蜡烛和警报器来测量宇宙学参数

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摘要

With the detection of gravitational wave (GW) GW170817 and its associated electromagnetic (EM) counterparts from a binary neutron star (NS) merger, the "standard siren" method for Hubble-constant measurements is expected to play a role in the Hubble-constant tension in the next few years. One intriguing proposal put forward in multiple studies is to use an NS merger's optical counterpart, known as a kilonova, as a standard candle, because its absolute magnitude can in principle be calculated from simulations. In this work, I detail the statistical framework for performing joint standard-candle and standard-siren measurements using GWs, EM follow-up data, and simulations of EM counterparts. I then perform an example analysis using GW170817 and its optical counterpart AT2017gfo to illustrate the method and the method's limitations. Crucially, the inferences using this method are only as robust as the EM counterpart models, so significant theoretical advances are needed before this method can be employed for precision cosmology.
机译：随着引力波（GW）GW170817及其相关的电磁（EM）对应于二进制中子星（NS）合并的，预计漏洞恒定测量的“标准Siren”方法将在漏洞常数中发挥作用未来几年的紧张局势。在多项研究中提出的一种有趣的提案是使用NS合并的光学对应物，称为千吨，作为标准蜡烛，因为其绝对幅度原则上可以根据仿真计算。在这项工作中，我详细介绍了使用GWS，EM随访数据和EM对应物模拟进行联合标准蜡烛和标准警报测量的统计框架。然后，我使用GW170817及其光学对手在2017GFO中执行示例分析，以说明方法和方法的限制。令人遗憾的是，使用该方法的推论仅作为EM对应模型的稳健，因此在这种方法可以用于精度宇宙学之前需要显着的理论前进。

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