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arXiv 2202.05231nucl-thastro-ph.HE
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冷恒星物质的朗道参数和卷吸矩阵:对称能和强磁场的影响

Landau parameters and entrainment matrix of cold stellar matter: effect of the symmetry energy and strong magnetic fields

Helena Pais, Oleksii Ivanytskyi, Constança Providência

摘要:

基于适用于描述多组分系统的相对论方法计算了核物质性质。我们使用一组核相对论平均场模型,满足可接受的核物质属性和中子星的观测。讨论了强外磁场对对称能密度依赖性和朗道量子化的影响。计算了冷态$β$平衡态物质的质子分数、朗道质量、朗道参数、夹带矩阵、绝热指数和声速等性质。在两到三倍饱和密度$ρ_0 $下,获得了计算出的特性的大分散。质子朗道质量可以低至真空核子质量的三分之一,在2-3 $~ρ_0 $。对于Landau参数,特别是涉及质子的Landau参数,获得了类似的效果,其中$F^0_{pp}$和$F^1_{pp}$的相对分散度在2-3 $~ρ_0 $时高达30%至50%。这些参数对对称能特别敏感。磁场对核性质的影响很小,除了在壳核过渡区上方的小范围密度外,磁场高达10 $^{18}$ G。在补充材料部分提供了包含EOS和参数的表格。

英文摘要:

Nuclear matter properties based on a relativistic approach suitable for the description of multi-component systems are calculated. We use a set of nuclear relativistic mean-field models that satisfy acceptable nuclear matter properties and neutron star observations. The effects of the density dependence of the symmetry energy and of the Landau quantization due to the presence of a strong external magnetic field are discussed. Properties such as the proton fraction, the Landau mass, Landau parameters and entrainment matrix, the adiabatic index and speed of sound are calculated for cold $β$-equilibrium matter. A large dispersion on the calculated properties is obtained at two to three times saturation density $ρ_0 $. The proton Landau mass can be as low as one third of the vacuum nucleon mass at 2-3$~ρ_0 $. Similar effects are obtained for the Landau parameters, in particular, the ones involving protons, where the relative dispersion of $F^0_{pp}$ and $F^1_{pp}$ is as high as 30\% to 50\% at 2-3$~ρ_0 $. These parameters are particularly sensitive to the symmetry energy. The effect of the magnetic field on the nuclear properties is small for fields as high as 10$^{18}$G except for a small range of densities just above the crust-core transition. Tables with the EoS, and the parameters, are provided in the Supplementary Material section.

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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