arXiv 1410.71662014-10-27nucl-thastro-ph.SRhep-phnucl-ex

用Dirac-Brueckner-Hartree-Fock方法研究含超子的中子星

Neutron stars with Hyperons in Dirac-Brueckner-Hartree-Fock approach

Tetsuya Katayama, Koichi Saito

备注：: 27 pages, 11 figures, 3 tables

摘要：

利用包含超子自由度的Dirac-Brueckner-Hartree-Fock（DBHF）方法研究了中子星物质的性质。为了处理物质中的超子，我们首先考察了重子自能空间部分在高密度下的重要性，然后研究了重子负能态的影响，从而给出了重子-重子散射的介质反应矩阵与重子自能之间的明确关系.在核物质静止坐标系下，我们用波恩势求解耦合的Bethe-Salpeter方程。我们假设八种非奇异和奇异介子（$σ,\,δ,\,ω,\,ρ,\,η,\,π,\,K,\,K^{\ast}$）参与了重子间的相互作用。然后计算了重子的自能、物质的能量密度和压强。本文的计算提供了一个由Pauli不相容效应、两重子间的短程关联等产生的高密度中子星物质的硬态方程。我们最终预测了$2.02\,M_{\odot}$的最大中子星质量，它与最近观测到的质量$1.97\pm0.04M_{\odot}$（J1614-2230）和$2.01\pm0.04M_{\odot}$（J 0348 +0432）相一致。

英文摘要：

Using the Dirac-Brueckner-Hartree-Fock (DBHF) approach including the hyperon degrees of freedom, we investigate the properties of neutron-star matter. To handle the hyperons in matter, we first examine the importance of the space part of baryon self-energies at high densities, and secondly study the effect of negative-energy states of baryons, which can provide an unambiguous relationship between the in-medium reaction matrices for baryon-baryon scattering and the baryon self-energies. We solve the coupled, Bethe-Salpeter equations in the nuclear-matter rest frame by using the Bonn potentials. We assume that eight kinds of nonstrange and strange mesons ($σ,\,δ,\,ω,\,ρ,\,η,\,π,\,K,\,K^{\ast}$) take part in the interactions between two baryons. Then, we calculate the baryon self-energies, the energy density and pressure of matter. The present calculation provides a hard equation of state in neutron-star matter at high densities, which is generated by the effect of Pauli exclusion, the short-range correlations between two baryons, etc. We finally predict the maximum neutron-star mass of $2.02\,M_{\odot}$, which is consistent with both the recently observed masses, $1.97\pm0.04M_{\odot}$ (J1614-2230) and $2.01\pm0.04M_{\odot}$ (J0348+0432).

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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英文摘要：

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