g-mode of neutron stars in pseudo-Newtonian gravity

被引：1

作者：

Li, Hong-Bo ^{[1
,2
]}

Gao, Yong ^{[1
,2
]}

Shao, Lijing ^{[2
,3
]}

Xu, Ren-Xin ^{[1
,2
]}

机构：

[1] Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China

[2] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[3] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 06期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

EQUATION-OF-STATE; NONRADIAL OSCILLATIONS; RELATIVISTIC REGIME; GRAVITATIONAL-WAVES; HYDRODYNAMICS;

D O I：

10.1103/PhysRevD.108.064005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The equation of state (EOS) of nuclear dense matter plays a crucial role in many astrophysical phenomena associated with neutron stars (NSs). Fluid oscillations are one of the most fundamental properties therein. NSs support a family of gravity g-modes, which are related to buoyancy. We study the gravity g-modes caused by composition gradient and density discontinuity in the framework of pseudoNewtonian gravity. The mode frequencies are calculated in detail and compared with Newtonian and general-relativistic (GR) solutions. We find that the g-mode frequencies in one of the pseudo-Newtonian treatments can approximate remarkably well the GR solutions, with relative errors in the order of 1%. Our findings suggest that, with much less computational cost, pseudo-Newtonian gravity can be utilized to accurately analyze oscillation of NSs constructed from an EOS with a first-order phase transition between nuclear and quark matter, as well as to provide an excellent approximation of GR effects in core-collapse supernova (CCSN) simulations.

引用

页数：15

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