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arXiv 1011.3563astro-ph.HEgr-qc
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均匀旋转致密星的自旋参数

The spin parameter of uniformly rotating compact stars

Ka-Wai Lo, Lap-Ming Lin

摘要:

本文在广义相对论中研究了匀速转动中子星和夸克星的无量纲自旋参数$j (= c J/ (G M^2))$。我们数值计算表明,在开普勒频率旋转的中子星的自旋参数的最大值是$j_{\rm max} \sim 0.7$的广泛的一类现实的状态方程。如果中子星的质量大于约$1 M_\odot$,这个上限对中子星的质量不敏感。另一方面,由MIT袋模型模拟的夸克星的自旋参数可以大于1,并且没有一个普遍的上限。它的值也很大程度上取决于袋常数和恒星的质量。我们的发现的天体物理学意义将被讨论。

英文摘要:

We study the dimensionless spin parameter $j (= c J/ (G M^2))$ of uniformly rotating neutron stars and quark stars in general relativity. We show numerically that the maximum value of the spin parameter of a neutron star rotating at the Keplerian frequency is $j_{\rm max} \sim 0.7$ for a wide class of realistic equations of state. This upper bound is insensitive to the mass of the neutron star if the mass of the star is larger than about $1 M_\odot$. On the other hand, the spin parameter of a quark star modeled by the MIT bag model can be larger than unity and does not have a universal upper bound. Its value also depends strongly on the bag constant and the mass of the star. Astrophysical implications of our finding will be discussed.

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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