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arXiv 1111.6049astro-ph.HEnucl-th
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超子和大质量中子星:超子势的作用

Hyperons and massive neutron stars: the role of hyperon potentials

Simon Weissenborn, Debarati Chatterjee, Juergen Schaffner-Bielich

摘要:

冷的致密物质的成分还远未被了解。然而,中子星的观测,如最近观测到的质量为1.97+/-0.04 M_solar的脉冲星PSR J1614-2230,有助于大大限制强子状态方程(EoS)。我们系统地研究了超子势对EoS刚度的影响。我们发现,他们有,但最大质量的影响不大相比,包括一个额外的矢量介子介导的超子之间的排斥相互作用。无论超子势如何,新的质量极限只能用这个额外的介子来达到。进一步,我们研究了核压缩模量和饱和密度下核子的有效质量对EoS高密度区的影响。结果表明,纯核子星的最大质量对有效核子质量非常敏感,而对压缩模量的敏感性很小。

英文摘要:

The constituents of cold dense matter are still far from being understood. However, neutron star observations such as the recently observed pulsar PSR J1614-2230 with a mass of 1.97+/-0.04 M_solar help to considerably constrain the hadronic equation of state (EoS). We systematically investigate the influence of the hyperon potentials on the stiffness of the EoS. We find that they have but little influence on the maximum mass compared to the inclusion of an additional vector meson mediating repulsive interaction amongst hyperons. The new mass limit can only be reached with this additional meson regardless of the hyperon potentials. Further, we investigate the impact of the nuclear compression modulus and the effective mass of the nucleon at saturation density on the high density regime of the EoS. We show that the maximum mass of purely nucleonic stars is very sensitive to the effective nucleon mass but only very little to the compression modulus.

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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