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arXiv 2004.08230astro-ph.HEhep-phnucl-th
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用致密核物质性质估算中子星观测值及其变化

Estimating the values and variations of neutron star observables by dense nuclear matter properties

Péter Pósfay, Gergely Gábor Barnaföldi, Antal Jakovác

摘要:

最近对PSR J 0030 +0451的NICER观测数据最近增加了一个独特的质量半径约束的超致密核物质存在于致密星内部的属性。这样的宏观数据进一步限制了微观模型,基本相互作用,以及它们的参数,然而,由于masquarade问题,具有合理的裕度。在这里,我们的目标是确定起源和量化的核物质模型的理论不确定性的大小。本文详细研究了不同相互作用项和核参数对扩展的$σ$ - $ω$模型的影响。将该状态方程代入Tolman-Oppenheimer-Schmidoff方程,计算了中子星的可观测参数。我们确定,最佳朗道有效质量是最相关的物理参数修改宏观可观测值。此外,可压缩性和对称性能量项仅产生一个数量级的影响,这分别。计算了致密星的最大质量与这些微观核参数在物理相关参数范围内的线性关系。基于大量观测数据,我们估计了PSR J1614-2230、PSR J 0348 +0432和PSR J 0740 +6620的半径大小,包括由模型的相互作用项及其参数值选择引起的理论不确定性。

英文摘要:

Recent NICER observation data on PSR J0030+0451 has recently added a unique mass-radius constraint on the properties of the superdense nuclear matter existing in the interior of compact stars. Such a macroscopic data restrict further the microscopical models, elementary interactions, and their parameters, however, with reasonable margin because of the masquarade problem. Here our goal is to identify the origin and quantify the magnitude of the theoretical uncertainties of the nuclear matter models. A detailed study on the effect of different interaction terms and the nuclear parameter values in the Lagrangian of the extended $σ$-$ω$ model is presented here. The equation of state was inserted to the Tolman--Oppenheimer--Volkoff equation and observable parameters of the neutron star were calculated. We identified, that the optimal Landau effective mass is the most relevant physical parameter modifying the macroscopic observable values. Moreover, the compressibility and symmetry energy terms just generate one-one order of magnitude smaller effect to this, respectively. We calculated the linear relations between the maximal mass of a compact star and these microscopic nuclear parameter values within the physical relevant parameters range. Based on the mass observational data we estimated the magnitude of the radii of PSR J1614-2230, PSR J0348+0432, and PSR J0740+6620 including theoretical uncertainties arising from the models' interaction terms and their parameter values choices.

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