发表机构
Columbia Astrophysics Laboratory, Columbia University; Institute of Theoretical Physics, University of Wrocław; Frankfurt Institute for Advanced Studies（哥伦比亚天体物理实验室，哥伦比亚大学; 弗罗茨瓦夫大学理论物理研究所; 法兰克福高等研究院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研究热强子星与混合星的基本径向振荡模式，发现中微子束缚和相变构造类型显著影响退禁闭起始及频率变化，可作为探测热致密星内部动力学的灵敏工具。
AI 中文摘要
我们研究了在原型中子星和中子星并合残骸相关条件下，热强子星和混合星的基本径向振荡模式。恒星背景由有限温度状态方程构建，其中强子物质采用协变密度泛函描述，高密度区域包含三味2SC夸克物质。我们考虑了两种等熵构型，分别处于中微子透明物质中以及在固定电子轻子分数下束缚电子中微子的情况。对于束缚物质，我们将具有全局电子轻子数守恒的Gibbs型构造与局部约束的Maxwell型方案进行比较；在两种情况下，固定熵恒星状态方程都包含一个扩展的共存区域，并且没有需要依赖于转换率的连接条件的尖锐界面。我们发现，基本径向频率在退禁闭开始之前遵循相应的纯强子序列，之后相对于该序列下降。中微子束缚将此动力学特征移至更大的恒星质量和中心压力，反映了夸克物质出现的延迟。Maxwell型方案将退禁闭的开始移至更高的中心压力，并在稳定性极限附近产生更快的模式频率下降。我们通过等引力质量下混合星与强子星之间的分数频率偏移来量化退禁闭效应。这些结果表明，基本径向模式为热致密星中熵、轻子束缚、相变构造和夸克退禁闭之间的相互作用提供了灵敏的动力学探针。
英文摘要
We study the fundamental radial oscillation mode of hot hadronic and hybrid stars under conditions relevant to proto-neutron stars and neutron-star merger remnants. The stellar backgrounds are constructed from finite-temperature equations of state with a covariant density functional for hadronic matter and three-flavor 2SC quark matter at high density. We consider two isentropic configurations in both neutrino-transparent matter and with trapped electron neutrinos at fixed electron-lepton fraction. For trapped matter we compare a Gibbs-type construction with global electron-lepton-number conservation to a locally constrained Maxwell-type prescription; in both cases the fixed-entropy stellar equation of state contains an extended coexistence region and no sharp interface requiring conversion rate-dependent junction conditions. We find that the fundamental radial frequency follows the corresponding purely hadronic sequence up to the onset of deconfinement and then decreases relative to it. Neutrino trapping shifts this dynamical signature to larger stellar masses and central pressures, reflecting the delayed appearance of quark matter. The Maxwell-type prescription moves the onset of deconfinement to still higher central pressure and produces a more rapid decrease of the mode frequency near the stability limit. We quantify the deconfinement effect through the fractional frequency shift between hybrid and hadronic stars at equal gravitational mass. These results show that the fundamental radial mode provides a sensitive dynamical probe of the interplay among entropy, lepton trapping, phase-transition construction, and quark deconfinement in hot compact stars.
Comments7 pages, 4 figures
