探索慢稳定及混合中子星的径向振荡
Exploring Radial Oscillations in Slow Stable and Hybrid Neutron Stars
AI总结：
本文通过研究中子星的径向振荡，揭示了非平衡效应在计算声速和绝热指数中的作用，扩展了恒星模型的稳定分支，为理解PSR J0740+6620的观测提供了新视角。
摘要：
在引力波天文学的时代，径向振荡在揭示中子星内部微观物理以及研究中子星稳定性方面具有重要潜力。我们首先构建了遵循核子、夸克性及混合方程Of状态的中子星家族，然后对它们施加径向扰动以探索这些恒星的稳定性。与其他文献不同，我们考虑了流体元素的非平衡效应对其化学组成的影响以计算径向模。考虑到这些因素，我们发现声速（c²_s）和绝热指数（γ）在平衡情况下避免了奇点和不连续性。我们通过研究非平衡物质分布情景来阐明基本径向模的响应，提供了对其动态变化的见解。我们还证明了这种方法扩展了恒星模型的稳定分支，使恒星能够维持稳定的高阶质量双峰，为PSR J0740+6620的观测和存在提供了一些启示。
英文摘要：
In the era of gravitational wave astronomy, radial oscillations hold significant potential for not only uncovering the microphysics behind the internal structure but also investigating the stability of neutron stars (NSs). We start by constructing families of static NSs following nucleonic, quarkyonic, and hybrid equations of state and then subject them to radial perturbations in order to explore the stability of these stars. Unlike other literature where the fluid elements are assumed to be in chemical equilibrium, we consider the out-of-equilibrium effects on the chemical composition of fluid elements for the calculation of radial modes. Taking these considerations into account, we observe that the sound speed ($c^2_s$) and adiabatic index ($γ$) avoid singularities and discontinuities over the equilibrium case. We elucidate the response of the fundamental radial modes by examining the out-of-equilibrium matter distribution scenario, offering insights into its dynamic variations. We also demonstrate that this approach extends the stable branches of stellar models, enabling stars to sustain stable higher-order mass doublets, shedding some light on observation and existence of PSR J0740+6620.
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