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arXiv 2010.06355gr-qcastro-ph.HEhep-th
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遥平行引力中的稳定自洽致密星模型

Stable and self-consistent compact star models in teleparallel gravity

Gamal G. L. Nashed, Salvatore Capozziello

摘要:

在遥平行引力理论的框架下,导出了具有两个未知径向坐标函数的物理对称四分体场的带电非真空解。场方程的结果在一个封闭的形式,采用特定的度规势和一个合适的各向异性函数相结合的电荷。在这种情况下,有可能获得一组与观测到的天体相容的组态。具体来说,内部时空的边界条件被应用到外部Reissner-Nordström度规上,以约束必须通过边界消失的径向压力。从这些考虑出发,我们能够固定模型参数。脉冲星$\textit {PSR J 1614--2230}$,估计质量为$M= 1.97 \pm 0.04\, M_{\circledcirc},$,半径为$R= 9.69 \pm 0.2$ km,用于数值检验模型。采用Tolman-Oppenheimer-Volkov方程,通过因果关系条件和绝热指数研究了系统的稳定性。导出了质量-半径$(M,R)$关系式。此外,还研究了该模式与其它观测资料的相容性。我们合理地得出结论,该模型可以表示现实紧凑的对象。

英文摘要:

In the framework of Teleparallel Gravity, we derive a charged non-vacuum solution for a physically symmetric tetrad field with two unknown functions of radial coordinate. The field equations result in a closed-form adopting particular metric potentials and a suitable anisotropy function combined with the charge. Under these circumstances, it is possible to obtain a set of configurations compatible with observed pulsars. Specifically, boundary conditions for the interior spacetime are applied to the exterior Reissner-Nordström metric to constrain the radial pressure that has to vanish through the boundary. Starting from these considerations, we are able to fix the model parameters. The pulsar $\textit {PSR J 1614--2230}$, with estimated mass $M= 1.97 \pm 0.04\, M_{\circledcirc},$ and radius $R= 9.69 \pm 0.2$ km is used to test numerically the model. The stability is studied, through the causality conditions and adiabatic index, adopting the Tolman-Oppenheimer-Volkov equation. The mass-radius $(M,R)$ relation is derived. Furthermore, the compatibility of the model with other observed pulsars is also studied. We reasonably conclude that the model can represent realistic compact objects.

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