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arXiv 0709.4081nucl-thastro-ph
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扩展场论模型中的非自转和自转中子星

Non-rotating and rotating neutron stars in the extended field theoretical model

Shashi K. Dhiman, Raj Kumar, B. K. Agrawal

摘要:

利用扩展的场论模型,研究了非旋转和旋转中子星在不同高密度状态下的性质。通过改变$ω-$介子自耦合和超子-介子耦合,这些EOS的高密度行为是不同的,以这样一种方式,适合于体核可观测量的质量,核物质不可压缩系数和超子-核子势深度几乎保持不受影响。我们发现非旋转中子星的最大质量的最大值是$2.1M_\odot$。具有正则质量的中子星的半径是$12.8 - 14.1$ km,前提是只考虑那些最大质量大于$1.6M_\odot$的EOS,因为它是迄今为止测量的最大质量的下限。我们对最近发现的旋转最快的中子星的研究结果表明,这颗恒星是超大质量的,质量为$1.7 - 2.7M_\odot$,圆周赤道半径为$12 - 19$ km。

英文摘要:

We study the properties of non-rotating and rotating neutron stars for a new set of equations of state (EOSs) with different high density behaviour obtained using the extended field theoretical model. The high density behaviour for these EOSs are varied by varying the $ω-$meson self-coupling and hyperon-meson couplings in such a way that the quality of fit to the bulk nuclear observables, nuclear matter incompressibility coefficient and hyperon-nucleon potential depths remain practically unaffected. We find that the largest value for maximum mass for the non-rotating neutron star is $2.1M_\odot$. The radius for the neutron star with canonical mass is $12.8 - 14.1$ km provided only those EOSs are considered for which maximum mass is larger than $1.6M_\odot$ as it is the lower bound on the maximum mass measured so far. Our results for the very recently discovered fastest rotating neutron star indicate that this star is supra massive with mass $1.7 - 2.7M_\odot$ and circumferential equatorial radius $12 - 19$ km.

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