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arXiv 1204.0101nucl-th
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在中子星相对论平均场描述中存在K介子时高阶耦合的作用

Role of higher order couplings in the presence of kaons in relativistic mean field description of neutron stars

Neha Gupta, P. Arumugam

摘要:

本文利用最近的相对论平均场模型讨论了高阶耦合在K介子凝聚中的作用,重点讨论了一种相互作用(G2),其中所有的参数都是通过拟合有限核数据得到的,并成功地应用于再现各种核性质。我们的结果表明,高阶耦合起着重要的作用,在较高的密度,其中K介子占主导地位的状态方程的行为。我们将我们的结果与其他相互作用(NL1,NL3,G1和FSUGold)进行比较,并表明新的耦合降低了中子星(NS)的质量,在存在K介子的情况下,中子星的质量进一步降低,从而产生与当前观测约束一致的结果。我们表明,NS的组成随参数集而变化。

英文摘要:

We discuss the role of higher order couplings in conjunction with kaon condensation using recent versions of relativistic mean field models.We focus on an interaction (G2) in which all the parameters are obtained by fitting the finite nuclear data and successfully applied to reproduce a variety of nuclear properties. Our results show that the higher order couplings play a significant role at higher densities where kaons dominate the behavior of the equation of state. We compare our results with other interactions (NLl, NL3, G1, and FSUGold) and show that the new couplings bring down the mass of a neutron star (NS), which is further reduced in the presence of kaons to yield results consistent with the present observational constraints. We show that the composition of the NS varies with the parameter sets.

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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