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arXiv 2201.03875nucl-thhep-ph
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中子星的夸克物质态

Quarkyonic matter state of neutron stars

Gaoqing Cao

摘要:

这一工作将我们以前对同位旋对称夸克物质的研究扩展到了可能与中子星内核有关的夸克中子物质。在模型中引入矢量-等矢量$ρ$介子主要是为了解释同位旋密度相互作用,就像$ω$介子解释重子密度相互作用一样。修正后的拉格朗日量仍然保持近似的手征对称性,这在较低的密度下可能会被显著破坏。通过对对称能及其饱和密度斜率的实验约束,确定了新的自由参数。最后,对夸克中子星的压强、质量-半径关系和潮汐形变进行了初步探索。虽然压力和潮汐变形性与实验和观测的限制很好地一致,但质量-半径关系无法重现PSR J 0740 +6620的观测到的两个太阳质量。

英文摘要:

This work extends our previous study of isospin symmetric quarkyonic matter to quarkyonic neutron matter which might be relevant to the inner cores of neutron stars. The vector-isovector $ρ$ mesons are introduced to the model mainly to account for isospin density interactions, just like $ω$ meson for baryon density interactions. The modified Lagrangian still preserves approximate chiral symmetry which could be significantly broken at lower density. And new free parameters are fixed by adopting the experimental constraints on the symmetry energy and its slope at saturation density. Eventually, the pressure, mass-radius relation, and tidal deformability are explored in advance for the quarkyonic neutron stars. While the pressure and tidal deformability are well consistent with experimental and observational restrictions, the mass-radius relation is unable to reproduce the observed two solar mass of PSR J0740+6620.

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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