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arXiv 2006.04512gr-qc
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基于最小几何变形方法的Durgapal IV模型

Durgapal IV model in light of the minimal geometric deformation approach

Francisco Tello-Ortiz, Ángel Rincón, Piyali Bhar, Y. Gomez-Leyton

摘要:

本文利用最小几何变形方法,在引力解耦的背景下,研究了局部各向异性对Durgapal第四模型的影响。为了做到这一点,最一般的状态方程有关的$θ$ -扇区的组件被施加,以获得的倍频功能$f(r)$。此外,还利用绝热指数、压力波的声速、对流因子和Harrison-Zeldovich-Novikov方法研究了该解的一些性质,如突出物质在恒星内部的流动行为、因果关系和能量条件、流体静力平衡(通过修正的Tolman-Oppenheimer-Schmidoff守恒方程)和克服局域各向异性的稳定性机制等。以检查模型是否在物理上可接受。关于稳定性分析,它被发现,该模型提出了不稳定的区域时,使用的压力波的声速和对流因子与绝热指数和Harrison-Zeldovich-Novikov的情况下发生的区别。为了产生更真实的图像,放置了一些已知致密物体的数值数据,并考虑了参数$α$的不同值,以与GR情况进行比较,即$α=0$。

英文摘要:

The present article is devoted to the study of local anisotropies effects on the Durgapal's fourth model in the context of gravitational decoupling via the Minimal Geometric Deformation approach. To do it, the most general equation of state relating the components of the $θ$--sector is imposed to obtain the decoupler function $f(r)$. In addition, certain properties of the obtained solution are investigated, such as the behavior of the salient material content threading the stellar interior, causality and energy conditions, hydrostatic balance through modified Tolman--Oppenheimer--Volkoff conservation equation and stability mechanism against local anisotropies by means of adiabatic index, sound velocity of the pressure waves, convection factor and Harrison--Zeldovich--Novikov procedure, in order to check if the model is physically admissible or not. Regarding the stability analysis, it is found that the model presents unstable regions when the sound speed of the pressure waves and convection factor are used in distinction with what happens in the adiabatic index and Harrison--Zeldovich--Novikov case. To produce a more realistic picture the numerical data for some known compact objects was placed and different values of the parameter $α$ were considered to compare with the GR case ı.e, $α=0$.

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