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arXiv 1607.03299gr-qcastro-ph.HE
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具有大质量标量场的快速旋转中子星--结构和普适关系

Rapidly rotating neutron stars with a massive scalar field - structure and universal relations

Daniela D. Doneva, Stoytcho S. Yazadjiev

摘要:

我们在标量张量理论中构造了一个有质量标量场的快速旋转中子星模型。标量场具有非零质量的事实导致了非常有趣的结果,因为耦合参数的允许值范围显著加宽。这些偏离纯广义相对论的参数值与观测值一致时,可能会非常大。与静态情况相比,快速旋转可以将差异放大数倍。研究了慢转和快转情况下归一化转动惯量与四极矩之间的普遍关系。结果表明,这些关系式在很大程度上仍然与物态方程无关,并且与纯广义相对论的偏差可能很大。这使得大量标量-张量理论成为少数几个可以通过普适的$I$ -Love- $Q$关系检验的引力理论之一。

英文摘要:

We construct rapidly rotating neutron star models in scalar-tensor theories with a massive scalar field. The fact that the scalar field has nonzero mass leads to very interesting results since the allowed range of values of the coupling parameters is significantly broadened. These deviations from pure general relativity can be very large for values of the parameters that are in agreement with the observations. The rapid rotation can magnify the differences several times compared to the static case. The universal relations between the normalized moment of inertia and quadrupole moment are also investigated both for the slowly and rapidly rotating cases. The results show that these relations are still EOS independent up to a large extend and the deviations from pure general relativity can be large. This places the massive scalar-tensor theories amongst the few alternative theories of gravity that can be tested via the universal $I$-Love-$Q$ relations.

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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