基于PSR J1614-2230、PSR J2124-3358和47 Tuc X7的新质量-半径约束的物态方程与中子星性质
Equation of state and neutron star properties with new mass-radius constraints from PSR~J1614--2230, PSR~J2124--3358, and 47~Tuc~X7
- Technische Universität Darmstadt（达姆施塔特工业大学）
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH（极端物质研究所 (EMMI)，德国重离子研究中心有限公司）
- Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究结合手征有效场论与微扰QCD约束的物态方程推断，利用PSR J1614-2230等的新质量-半径信息，收紧了压强和声速后验分布，减小大质量中子星半径，并预测了两颗脉冲星的质量。
AI中文摘要：
我们在结合核密度下手征有效场论约束及不同高密度扩展（包括微扰QCD约束）的物态方程推断中，研究了PSR J1614-2230、PSR J2124-3358和47 Tuc X7的新质量-半径信息的影响。最大的影响来自大质量脉冲星PSR J1614-2230，它使大质量中子星的半径减小了约0.4 km。此外，结合天体物理观测数据NICER、LIGO/Virgo及X射线信息，使半径后验分布更偏向数据驱动的分布，对高密度扩展的敏感性降低。对于物态方程，新的质量-半径信息显著收紧了压强和声速的后验分布，尤其是在饱和核密度的3倍附近。最后，我们基于结合的物态方程分析及其他天体物理源，对PSR J2124-3358和47 Tuc X7的质量（约束较差）做出预测。
英文摘要：
We study the impact of new mass-radius information from PSR J1614-2230, PSR J2124-3358, and 47 Tuc X7 in a combined equation of state inference based on chiral effective field theory constraints at nuclear densities and using different high-density extensions, including perturbative QCD constraints. The largest impact stems from the heavy-mass PSR J1614-2230 star, which shifts heavy neutron stars to smaller radii by around 0.4 km. Moreover, the combined astrophysical NICER, LIGO/Virgo, and X-ray information drives the radius posterior to a more data-driven distribution, which is less sensitive to the high-density extension. For the equation of state, the new mass-radius information significantly tightens the pressure and speed-of-sound posterior distributions, especially around three times saturation density. Finally, we make predictions for the poorly constrained masses of PSR J2124-3358 and 47 Tuc X7 based on the combined equation of state analysis and the other astrophysical sources.
