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arXiv 1608.00344nucl-thastro-ph.HEastro-ph.SR
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致密物质中的声速界限和中子星结构

Bounds on the speed of sound in dense matter, and neutron star structure

Ch. C. Moustakidis, T. Gaitanos, Ch. Margaritis, G. A. Lalazissis

摘要:

准确测定中子星的最大质量是天体物理学的重要任务之一。它直接关系到宇宙中黑洞的识别、超新星爆炸产生中子星以及稠密物质的状态方程。然而,不仅EoS与中子星质量直接相关,而且致密物质中的声速也是表征EoS刚度的关键量。声速的上界对中子星的最大质量有很强的限制。然而,这个上限仍然是一个悬而未决的问题。最近对双中子星系统的观测,提供了高精度测量恒星质量和潮汐极化率的可能性。研究了声速上限对质量上限和潮汐极化率的可能影响。我们的结论是,这些类型的测量,结合最近的中子星的观测质量接近$2 M_{\odot}$,将提供强大的约束状态方程的强子物质在高密度。

英文摘要:

The accurate determination of the maximum mass of the neutron stars is one of the most important tasks in astrophysics. It is directly related to the identification of the black holes in the universe, the production of neutron stars from the supernovae explosion, and the equation of state (EoS) of dense matter. However, not only the EoS is directly connected with neutron star masses, but also the speed of sound in dense matter is a crucial quantity which characterizes the stiffness of the EoS. The upper bound of the speed of sound imposes strong constraints on the maximum mass of neutron stars. However, this upper bound remains still an open issue. Recent observations, of binary neutron star systems, offer the possibility of measuring with high accuracy both the mass and the tidal polarizability of the stars. We study possible effects of the upper bound of the speed of sound on the upper bound of the mass and the tidal polarizability. We conclude that these kinds of measurements, combined with recent observations of neutron stars with masses close to $2 M_{\odot}$, will provide robust constraints on the equation of state of hadronic matter at high densities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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