不稳定各向异性中子星：探测引力坍缩的极限
Unstable Anisotropic Neutron Stars: Probing the Limits of Gravitational Collapse
AI总结：
本文研究了局部各向异性中子星的稳定性与引力坍缩，利用BL-Model和强子-夸克相变EOSs分析径向微扰下的动力学演化，并提出探测此类高能事件的新方法。
摘要：
中子星（NSs）在研究高能和致密天体物理学的各种重要方面具有极其多样的用途。这些天体内部包含极高密度下的极端物质，导致存在不稳定性的风险，可能使其坍缩成黑洞（BH）。本文重点探讨NSs的稳定性与引力坍缩。为了采用更现实的方法，我们考虑压力为局部各向异性。我们利用BL-Model来描述NS内部的各向异性。NS核心中夸克的存在会严重影响其稳定性。因此，除了纯强子EOSs外，我们还考虑了强子-夸克相变（HQPT）EOSs用于本文的分析。我们对各向异性NSs施加径向微扰，以研究其针对径向振荡的稳定性。表现出虚数特征频率的NSs被判定为不稳定，其必然命运是引力坍缩，最终形成BH。我们将这些不稳定各向异性NSs的内部视为非绝热背景下的非理想流体，以研究其在坍缩期间的动力学演化。我们考察了引力坍缩过程中NSs的关键特性（如质量、密度、热通量和各向异性）的时间演化。我们提出了一种创新且可行的方法来探测此类高能引力坍缩事件，为坍缩前静态NS的性质提供了有价值的见解。
英文摘要：
Neutron stars (NSs) are incredibly versatile for studying various important aspects of high-energy and compact-object physics. These celestial objects contain extreme matter at incredibly high densities in their interiors, leading to the risk of instabilities that may cause them to collapse into a black hole (BH). This paper focuses on exploring the stability and gravitational collapse of NSs. For a more realistic approach we have considered the pressure to be locally anisotropic. We utilize the BL-Model to describe the anisotropy inside the NS. The presence of quarks in the core of an NS can heavily affect its stability. Hence, along with pure hadronic EOSs, we have also considered Hadron-Quark phase transition (HQPT) EOSs for this paper's analysis. We subject the anisotropic NSs to radial perturbations to study their stability against radial oscillations. NSs exhibiting imaginary eigen-frequencies are identified as unstable, and their inevitable destiny is gravitational collapse, resulting in the formation of a BH. We consider the interior of these unstable anisotropic NSs to be a non-ideal fluid in a non-adiabatic background in order to study its dynamical evolution during the collapse. We examine the temporal evolution of key properties of NSs, such as mass, density, heat flux, and anisotropy during the process of gravitational collapse. We present an innovative and viable approach to detect such high-energy gravitational collapse events, providing valuable insights into the properties of the static NS before its collapse.
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