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arXiv 2303.04472gr-qc
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非最小耦合引力中带电致密星的研究

Study of Charged Compact Stars in Non-minimally Coupled Gravity

M. Sharif, Tayyab Naseer

AI总结:

该研究在$f(\mathcal{R},\mathcal{T},\mathcal{Q})$引力框架下结合电磁场与袋模型,构建球对称各向异性带电致密星的修正场方程,计算相关参数并验证了解的稳定性与物理合理性。

摘要:

本文研究了电磁场作用下$f(\mathcal{R},\mathcal{T},\mathcal{Q})$引力中各类球对称各向异性构型恒星的结构形成,其中$\mathcal{Q}=\mathcal{R}_{\eta\sigma}\mathcal{T}^{\eta\sigma}$。我们通过采用含未知量$(A,B,C)$的Krori-Barua度规势构建了修正场方程,并利用袋模型物态方程探究了Vela X-I、4U 1820-30、SAX J 1808.4-3658、Her X-I和RXJ 1856-37等致密结构的物理特征。袋常数$(\mathfrak{B_c})$和另外三个未知量通过所有研究恒星的实验数据计算得到。此外,我们采用标准模型$\mathcal{R}+\varpi\mathcal{R}_{\eta\sigma}\mathcal{T}^{\eta\sigma}$来解释能量密度、径向与切向压强以及各向异性的图像行为。我们还通过取模型参数$(\varpi)$为$\pm5$,研究了致密天体的质量、致密性参数、表面红移和能量条件。所得解的稳定性通过两种不同判据进行了检验。我们得出结论,所提出的解满足所有物理要求,且在$\varpi=5$时处处表现出稳定行为。

英文摘要:

This paper studies the structural formation of various spherically symmetric anisotropic configured stars in $f(\mathcal{R},\mathcal{T},\mathcal{Q})$ gravity under the influence of electromagnetic field, where $\mathcal{Q}=\mathcal{R}_{ησ}\mathcal{T}^{ησ}$. We construct modified field equations by adopting the Krori-Barua metric potentials (involving unknowns ($A,B,C$)) and employ bag model equation of state to explore the physical characteristics of compact structures like Vela X-I,~4U 1820-30,~SAX J 1808.4-3658,~Her X-I and RXJ 1856-37. The bag constant ($\mathfrak{B_c}$) and other three unknowns are calculated by using experimental data of all considered stars. Further, we adopt a standard model $\mathcal{R}+\varpi\mathcal{R}_{ησ}\mathcal{T}^{ησ}$ to interpret the graphical behavior of energy density, pressure in radial and tangential directions as well as anisotropy. We also investigate mass, compactness parameter, surface redshift and energy conditions for compact bodies by taking model parameter ($\varpi$) as $\pm5$. The stability of the obtained solution is examined by means of two different criteria. We conclude that our proposed solution meets all the physical requirements and shows stable behavior everywhere for $\varpi=5$.

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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