Dynamical Analysis of a Charged Spherical Star in \(\boldsymbol{R-}\boldsymbol{\beta}\boldsymbol{R}_{\boldsymbol{c}}\mathbf{tanh}\boldsymbol{(R/R_{c})+}\boldsymbol{\xi}\boldsymbol{RT}\) Gravity

IF 1.2 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Gravitation and Cosmology Pub Date : 2023-11-23 DOI:10.1134/S0202289323040047
M. Z. Bhatti, Z. Yousaf, M. Yousaf
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Abstract

We illustrate the dynamical instability of charged spherical fluid configuration with anisotropic conditions in nonminimally coupled \(f(R,T)\) theory of gravitation, where \(R\) is the Ricci scalar and \(T\) is the trace of the energy momentum-tensor. We investigate both modified field equations and continuity equations to provide some extra degrees of freedom under the constraints of a specific considered form of \(f(R,T)\) gravity. We examine how small changes in geometric and material profiles affect the fluid’s collapsing structure via a perturbation scheme. We study the unstable eras using Newtonian (\(\mathbb{N}\)) and post-Newtonian (pN) approximations by applying some significant constraints on the collapse equation. Our findings demonstrate that the stiffness parameter \(\Gamma\) has a substantial influence on the identification of unstable phases for our charged stellar geometry. We conclude that some correction terms that are dark source terms, which appear due to \(f(R,T)\) gravity, lead to an unstable structure/phase throughout the evolutionary process.

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带电球星在\(\boldsymbol{R-}\boldsymbol{\beta}\boldsymbol{R}_{\boldsymbol{c}}\mathbf{tanh}\boldsymbol{(R/R_{c})+}\boldsymbol{\xi}\boldsymbol{RT}\)重力作用下的动力学分析
在非最小耦合\(f(R,T)\)引力理论中,我们说明了各向异性条件下带电球形流体结构的动力学不稳定性,其中\(R\)为里奇标量,\(T\)为能量动量张量的迹线。我们研究了修正的场方程和连续性方程,以在特定考虑形式\(f(R,T)\)重力的约束下提供一些额外的自由度。我们研究几何和材料剖面的微小变化如何通过摄动方案影响流体的坍塌结构。我们使用牛顿(\(\mathbb{N}\))和后牛顿(pN)近似,通过对坍缩方程施加一些重要的约束来研究不稳定时代。我们的发现表明,刚度参数\(\Gamma\)对我们带电恒星几何结构的不稳定相的识别有实质性的影响。我们得出结论,一些暗源项的修正项,由于\(f(R,T)\)重力而出现,导致整个进化过程中的结构/阶段不稳定。
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来源期刊
Gravitation and Cosmology
Gravitation and Cosmology ASTRONOMY & ASTROPHYSICS-
CiteScore
1.70
自引率
22.20%
发文量
31
审稿时长
>12 weeks
期刊介绍: Gravitation and Cosmology is a peer-reviewed periodical, dealing with the full range of topics of gravitational physics and relativistic cosmology and published under the auspices of the Russian Gravitation Society and Peoples’ Friendship University of Russia. The journal publishes research papers, review articles and brief communications on the following fields: theoretical (classical and quantum) gravitation; relativistic astrophysics and cosmology, exact solutions and modern mathematical methods in gravitation and cosmology, including Lie groups, geometry and topology; unification theories including gravitation; fundamental physical constants and their possible variations; fundamental gravity experiments on Earth and in space; related topics. It also publishes selected old papers which have not lost their topicality but were previously published only in Russian and were not available to the worldwide research community
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