New classes of charged 4D EGB spacetimes with vanishing Weyl curvature

IF 4.2 2区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS The European Physical Journal C Pub Date : 2024-11-15 DOI:10.1140/epjc/s10052-024-13526-7

Sudan Hansraj, Siyamthanda Remember Mngadi, Abdelghani Errehymy

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Abstract

The configuration of a perfect fluid distribution in an electric field under the influence of higher curvature geometric effects introduced through the Gauss–Bonnet invariants is studied in the 4 dimensional Glavan–Lin gravity formulation. It is found that whereas a constant spatially directed gravitational potential gives isothermal behaviour in the standard theory, this is not the case when extra curvature is present in general. A physically viable stellar model is constructed by assuming the Finch–Skea potential. The geometry and electrodynamics are well behaved being regular throughout the distribution including the centre. The model passes stability tests such as the Chandrasekar adiabatic stability criterion and causality. Additionally all energy conditions are satisfied within the star. We compare the performance of the model with its Einstein counterpart and observe that the higher curvature exerts a notable influence on all the physical properties of the star.

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韦尔曲率消失的带电 4D EGB 空间新类别

在 4 维格拉万-林引力公式中，研究了电场中完美流体分布在高斯-波内特不变量引入的高曲率几何效应影响下的构型。研究发现，在标准理论中，恒定的空间定向引力势会产生等温行为，而当存在额外曲率时，情况就不是这样了。通过假定芬奇-斯基亚势，构建了一个物理上可行的恒星模型。几何和电动力学表现良好，包括中心在内的整个分布都很规则。模型通过了稳定性测试，如钱德拉塞卡绝热稳定性标准和因果关系。此外，恒星内部满足所有能量条件。我们将该模型的性能与其对应的爱因斯坦模型进行了比较，发现较高的曲率对恒星的所有物理特性都有显著影响。

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来源期刊

The European Physical Journal C 物理-物理：粒子与场物理

CiteScore

8.10

自引率

15.90%

发文量

1008

审稿时长

2-4 weeks

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