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arXiv 2106.08474astro-ph.HEnucl-th
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超声波中子星核的输运系数

Transport coefficients of hyperonic neutron star cores

Peter Shternin, Isaac Vidaña

摘要:

研究了超核物质在中子星核中的输运性质。特别是,我们计算的导热系数,剪切粘度,和动量传递率为NP $Σ^{-}Λeμ$组成的致密物质在$β$-平衡的重子数密度范围内的$0.1-1$ ~FM $^{-3}$。计算是基于非相对论Brueckner-Hartree-Fock理论框架内处理的重子相互作用。裸核子-核子(NN)相互作用用Argonne v18唯象势描述,并补充了Urbana IX三核子力。核子-超子(NY)和超子-超子(YY)相互作用是基于奈梅亨群的\new{NSC97e and NSC97a models}。我们发现,重子对输运系数的贡献主要是由中子的情况下,中子星核心只包含核子。特别是,我们发现,中子占主导地位的总热导率在整个范围内的密度探索和,由于$Σ^-$的发病导致的去质子化的中子星核心,他们也占主导地位的剪切粘度在高密度区域,与纯核子的情况下,轻子的贡献总是占主导地位的。

英文摘要:

We consider transport properties of the hypernuclear matter in neutron star cores. In particular, we calculate the thermal conductivity, the shear viscosity, and the momentum transfer rates for np$Σ^{-}Λeμ$ composition of dense matter in $β$--equilibrium for baryon number densities in the range $0.1-1$~fm$^{-3}$. The calculations are based on baryon interactions treated within the framework of the non-relativistic Brueckner-Hartree-Fock theory. Bare nucleon-nucleon (NN) interactions are described by the Argonne v18 phenomenological potential supplemented with the Urbana IX three-nucleon force. Nucleon-hyperon (NY) and hyperon-hyperon (YY) interactions are based on the \new{NSC97e and NSC97a models} of the Nijmegen group. We find that the baryon contribution to transport coefficients is dominated by the neutron one as in the case of neutron star cores containing only nucleons. In particular, we find that neutrons dominate the total thermal conductivity over the whole range of densities explored and that, due to the onset of $Σ^-$ which leads to the deleptonization of the neutron star core, they dominate also the shear viscosity in the high density region, in contrast with the pure nucleonic case where the lepton contribution is always the dominant one.

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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