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arXiv 2411.03490nucl-thastro-ph.HEastro-ph.SRnucl-ex
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评估均匀旋转对中子星结构的影响

Assessing the impact of uniform rotation on the structure of neutron stars

Marc Salinas, Jorge Piekarewicz

AI总结:

本研究探讨均匀旋转对中子星最大质量与半径的影响,并分析其对状态方程硬度的启示,以解释低质量间隙附近的大质量致密天体。

摘要:

受近期实验室实验和天文观测的推动,重大进展加深了我们对中子星物理的理解。NICER的脉冲轮廓建模细化了我们对中子星质量和半径的认识,而引力波探测则揭示了中子星结构的关键信息。尤其相关的是LIGO-Virgo合作组对潮汐形变性的提取以及NICER最近对恒星半径的测定,两者均表明在中等密度下状态方程(EOS)相对较软。此外,PREX合作组和脉冲星计时测量的结果则表明,在饱和密度附近及迄今为止可达到的最高密度下,状态方程是较硬的。但在这些极高密度下,状态方程能有多硬?近期涉及接近“低质量间隙”的致密天体的事件引发了对是否存在极高质量中子星的疑问。受这一发现及理论模型新改进的启发,我们探讨了这些大质量天体可能确实是快速旋转中子星的可能性。我们研究了旋转如何影响最大中子星质量及其相关半径,并讨论了它们可能对状态方程产生的影响。

英文摘要:

Driven by recent laboratory experiments and astronomical observations, significant advances have deepened our understanding of neutron-star physics. NICER's Pulse Profile Modeling has refined our knowledge of neutron star masses and radii, while gravitational-wave detections have revealed key insights into the structure of neutron stars. Particularly relevant is the extraction of the tidal deformability by the LIGO-Virgo collaboration and the most recent determination of stellar radii by NICER, both suggesting a relatively soft equation of state (EOS) at intermediate densities. Additionally, measurements from the PREX collaboration and from pulsar timing suggest instead that the EOS is stiff in the vicinity of saturation density and at the highest densities accessible to date. But how stiff can the EOS be at these very high densities? Recent events featuring compact objects near the "lower mass gap" have raised questions about the existence of very massive neutron stars. Motivated by this finding and in light of new refinements to theoretical models, we explore the possibility that these massive objects may indeed be rapidly rotating neutron stars. We explore how rotation affects both the maximum neutron star mass and their associated radii, and discuss the implications they may have on the equation of state.

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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