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arXiv 1502.04952nucl-th
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对称能和超子相互作用对中子星的影响

Effect of the symmetry energy and hyperon interaction on neutron stars

Daniel Bizarro, Aziz Rabhi, Constança Providência

摘要:

在相对论平均场论框架下,研究了对称能和奇异含量的密度依赖性对冷中子星结构的联合影响。结果表明,2 $M_\odot$得到排斥$YY$相互作用,并优选为一个小的或一个大的斜率$L$。在核物质中,一个吸引的$Σ$势将有利于质量像$\sim 1 M_\odot$一样小的恒星出现奇异性,然而,如果它是排斥的,只有质量为$\gtrsim 1.4 M_\odot$的恒星才会包含奇异性。减小对称性能量斜率和包含超子的联合效应是进一步减小半径。中子星最大质量随对称性能量斜率的变化呈非单调变化,最小质量值为$L\sim 80$ MeV。其他中子星变星随对称能的斜率呈非线性演化,并依赖于超子-核子和超子-超子耦合。中子星的半径与中子星的总奇异度成线性关系,其斜率与中子星的质量和对称能的斜率无关。

英文摘要:

The joint effect of the density dependence of the symmetry energy and strangeness content on the structure of cold neutron stars is studied within the framework of a relativistic mean field theory. It is shown that 2$M_\odot$ are obtained for repulsive $YY$ interaction and preferably for a small or a large slope $L$. An attractive $Σ$ potential in nuclear matter will favor the appearance of strangeness in stars with a mass as small as $\sim 1 M_\odot$, if, however it is repulsive only stars with a mass $\gtrsim 1.4 M_\odot$ will contain strangeness. The joint effect of reducing the symmetry energy slope and including hyperons is to farther reduce the radius. Neutron star maximum mass evolve non-monotonically with the symmetry energy slope, and the smallest masses are obtained for values $L\sim 80$ MeV. Other neutron star variables evolve nonlinearly with the slope of the symmetry energy and depend on the hyperon-nucleon and hyperon-hyperon couplings. The radius of a neutron star is linearly correlated with the neutron star total strangeness fraction and the slope is independent of the slope of the symmetry energy and the mass of the star.

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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