Abstract

We propose a universal approximation of the equation of state of superdense matter in neutron star (NS) interiors. It contains only two parameters, the pressure and the density at the center of the maximally massive neutron star. We demonstrate the validity of this approximation for a wide range of different types of equations of state, including both baryonic and hybrid models. Combined with recently discovered correlations of internal (density, pressure, and speed of sound at the center) and external (mass, radius) properties of a maximally massive neutron star, this approximation turns out to be an effective tool for determining the equation of state of superdense matter using astrophysical observations.

中文翻译：

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最大质量中子星是超稠密物质物理的关键

摘要

我们提出了中子星（NS）内部超致密物质状态方程的通用近似。它只包含两个参数：最大质量中子星中心的压力和密度。我们证明了这种近似对于各种不同类型的状态方程（包括重子模型和混合模型）的有效性。结合最近发现的最大质量中子星的内部（中心的密度、压力和声速）和外部（质量、半径）属性的相关性，这种近似被证明是确定状态方程的有效工具利用天体物理学观测来研究超致密物质。