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arXiv 2307.15366nucl-th
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一阶相变导致的旋转中子星性质中的脊状结构

Ridges in rotating neutron-star properties due to first order phase transitions

Pablo Navarro Moreno, Felipe J. Llanes-Estrada, Eva Lope-Oter

AI总结:

本研究利用Hartle-Thorne理论分析旋转中子星的椭率、角动量等可观测量,发现一阶相变会在其中留下脊状非解析特征,还探讨了旋转星外光环探测对物态方程的约束作用。

摘要:

我们确定了旋转中子星的若干可观测量组合,未来可用于探究中子星内部的中子物质是否存在一阶相变的问题。我们采用Hartle-Thorne(哈特尔-索恩)理论研究处于常规角速度(脉冲星和毫秒脉冲星区间)的稳态旋转中子星,提取了椭率或动力学角动量作为恒星质量和角速度函数的三维截面。物态方程(EoS)中若存在一阶相变,会在这些可观测量中留下清晰的脊状结构(非解析性),类似于静态恒星常见的质量-半径图中的突变扭折。最后我们发现,广义相对论(GR)中的静态中子星致密程度不足以让位于r=3M的光环处于恒星外部,只有最极端的物态方程是例外。但旋转恒星的外光环有可能形成,除非物态方程过软,而对其的最终探测可用于约束物态方程(或引力理论)。

英文摘要:

We identify combinations of observables for rotating neutron stars that can one day bear on the question of whether there can be first order phase transitions in the neutron matter therein. We employ the Hartle-Thorne theory for stationary, rotating neutron stars at conventional angular velocities (in the pulsar and millisecond pulsar ranges) and extract three-dimensional sections of the ellipticity or the dynamical angular momentum as function of the star's mass and angular velocity. An eventual first order phase transition in the equation of state (EoS) leaves a clear ridge (nonanalyticity) in these observables, akin to the sudden kink in popular mass-radius diagrams for static stars. Finally, we observe that static neutron stars in General Relativity (GR) will fail to be compact enough for the light ring's position at r=3M to be outside the star, except for the most extreme equations of state. The outer light ring of a rotating star might however be formed unless the EoS softens too much, and its eventual detection can then be used to constrain the EoS (or the gravity theory).

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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