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arXiv 1302.1698nucl-th
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中子星相对论平均场研究中的反K介子和高阶耦合

Antikaons and higher order couplings in relativistic-mean field study of neutron stars

Neha Gupta, P. Arumugam

摘要:

研究了高阶耦合以及反K介子($K^-$和$\bar K^0$)凝聚对中子星(NS)性质的影响.我们采用扩展版本的相对论平均场模型,其中K介子核子和核子核子相互作用采取相同的立足点。我们发现$K^-$和$\bar K^0$凝聚的开始不仅高度依赖于光学势的强度,而且依赖于新的耦合。反康子的存在导致了一个更软的状态方程,并使中子星的核心对称和缺乏轻子。结果表明,这些效应对中子星的质量-半径关系以及中子星的组成有很大的影响。我们还表明,最近观察到的1.97 $\pm$ .04太阳质量NS可以解释在三个方面:(i)一个较硬的EoS与两个反K介子,(ii)一个相对较软的EoS与$K^-$和(iii)较软的EoS没有反K介子。

英文摘要:

We investigate the role of higher order couplings, along with the condensation of antikaons ($K^-$ and $\bar K^0$), on the properties of neutron star (NS). We employ extended versions of the relativistic mean-field model, in which kaon-nucleon and nucleon-nucleon interactions are taken on the same footing. We find that the onset of condensation of $K^-$ and $\bar K^0$ highly depends not only on the strength of optical potential but also on the new couplings. The presence of antikaons leads to a softer equation of state and makes the neutron star core symmetric and lepton-deficient. We show that these effects strongly influence the mass-radius relation as well as the composition of neutron star. We also show that the recently observed 1.97$\pm$.04 solar mass NS can be explained in three ways: (i) a stiffer EoS with both antikaons, (ii) a relatively soft EoS with $K^-$ and (iii) a softer EoS without antikaons.

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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