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arXiv 1602.04766gr-qcastro-ph.HE
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具有大质量标量场的标量-张量理论中的慢转中子星

Slowly rotating neutron stars in scalar-tensor theories with a massive scalar field

Stoytcho S. Yazadjiev, Daniela D. Doneva, Dimitar Popchev

摘要:

在有质量标量场的标量-张量理论中,观测上允许的耦合常数和一般的耦合函数与无质量情况下的耦合常数和耦合函数可能有很大的不同。这一事实自然意味着,具有大质量标量场的标量张量中子星与无质量情况下和广义相对论中的对应物相比,可以具有相当不同的结构和性质。本文用标量-张量理论研究了慢旋转中子星,其中有一个大质量的引力标量。标量张量理论的两个例子进行检查-第一个例子是大规模的Brans-Dicke理论和第二个是一个大规模的标量张量理论区分从广义相对论在弱场极限。在后一种情况下,我们研究了标量场质量对中子星自发标量化的影响。我们的数值结果表明,包含一个质量项的标量场确实改变了图片急剧相比,无质量的情况。结果表明,当考虑足够大质量的标量场时,大质量标量张量理论中的中子星的质量、半径和转动惯量与纯广义相对论解有很大的不同.

英文摘要:

In the scalar-tensor theories with a massive scalar field the coupling constants, and the coupling functions in general, which are observationally allowed, can differ significantly from those in the massless case. This fact naturally implies that the scalar-tensor neutron stars with a massive scalar field can have rather different structure and properties in comparison with their counterparts in the massless case and in general relativity. In the present paper we study slowly rotating neutron stars in scalar-tensor theories with a massive gravitational scalar. Two examples of scalar-tensor theories are examined - the first example is the massive Brans-Dicke theory and the second one is a massive scalar-tensor theory indistinguishable from general relativity in the weak field limit. In the later case we study the effect of the scalar field mass on the spontaneous scalarization of neutron stars. Our numerical results show that the inclusion of a mass term for the scalar field indeed changes the picture drastically compared to the massless case. It turns out that mass, radius and moment of inertia for neutron stars in massive scalar-tensor theories can differ drastically from the pure general relativistic solutions if sufficiently large masses of the scalar field are considered.

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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