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arXiv 0705.1738nucl-thnucl-ex
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具有手征极限的相对论平均场模型中同位旋非对称核物质的物态方程

Equation of state of isospin-asymmetric nuclear matter in relativistic mean-field models with chiral limits

Wei-Zhou Jiang, Bao-An Li, Lie-Wen Chen

摘要:

利用高密度下手征对称性恢复引起的Brown-Rho标度下的介质中强子性质,并考虑到耦合常数的自然性,我们新构造了几个具有手征极限的相对论平均场拉格朗日量.调整模型参数,使所得的状态方程在超常密度的对称部分是一致的,所需的集体流数据从高能量重离子反应,而所得的密度依赖性的对称能在亚饱和密度同意从最近的中能重离子反应的同位旋扩散数据提取。所得的状态方程具有在中等密度下软而在高密度下自然硬的特点。利用这些约束状态方程,我们发现1.4 $M_\odot$正则中子星的半径在11.9 km $\leq$ R $\leq$ 13.1 km的范围内,中子星的最大质量在2.0 $M_\odot$左右,与最近的观测结果接近.

英文摘要:

Using in-medium hadron properties according to the Brown-Rho scaling due to the chiral symmetry restoration at high densities and considering naturalness of the coupling constants, we have newly constructed several relativistic mean-field Lagrangians with chiral limits. The model parameters are adjusted such that the symmetric part of the resulting equation of state at supra-normal densities is consistent with that required by the collective flow data from high energy heavy-ion reactions, while the resulting density dependence of the symmetry energy at sub-saturation densities agrees with that extracted from the recent isospin diffusion data from intermediate energy heavy-ion reactions. The resulting equations of state have the special feature of being soft at intermediate densities but stiff at high densities naturally. With these constrained equations of state, it is found that the radius of a 1.4$M_\odot$ canonical neutron star is in the range of 11.9 km$\leq$R$\leq$13.1 km, and the maximum neutron star mass is around 2.0$M_\odot$ close to the recent observations.

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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