Probing Extreme-density Matter with Gravitational-wave Observations of Binary Neutron Star Merger Remnants
Probing Extreme-density Matter with Gravitational-wave Observations of Binary Neutron Star Merger Remnants
复制标题
利用双中子星合并遗迹的引力波观测探测极端密度物质
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
C. Ott
中科院分区：
文献类型：
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作者：
D. Radice;S. Bernuzzi;W. D. Pozzo;L. Roberts;C. Ott
我们提出了一项概念验证研究，基于数值相对论模拟，来自中子星合并残留物的引力波（GWs）如何在极端密度下探测物质的本质。相变和额外的自由度可以在密度超过吸气时达到的密度时出现，并且通常会导致状态方程（EOS）的软化。我们发现这种物理效应改变了残余演化的定性动力学，但除了可能的黑洞形成效应外，它们不能被识别为GW频率的特征。相反，EOS的软化被编码在GW的光度和相位中，原则上可以用先进的探测器探测到几个百万秒差距的距离，用第三代探测器探测到几百百万秒差距的距离。探测极端密度的物质需要超越目前的模式，并开发一种更全面的策略来建模和分析合并后的GW信号。
We present a proof-of-concept study, based on numerical-relativity simulations, of how gravitational waves (GWs) from neutron star merger remnants can probe the nature of matter at extreme densities. Phase transitions and extra degrees of freedom can emerge at densities beyond those reached during the inspiral, and typically result in a softening of the equation of state (EOS). We show that such physical effects change the qualitative dynamics of the remnant evolution, but they are not identifiable as a signature in the GW frequency, with the exception of possible black hole formation effects. The EOS softening is, instead, encoded in the GW luminosity and phase and is in principle detectable up to distances of the order of several megaparsecs with advanced detectors and up to hundreds of megaparsecs with third-generation detectors. Probing extreme-density matter will require going beyond the current paradigm and developing a more holistic strategy for modeling and analyzing postmerger GW signals.