Cosmological solution through gravitational decoupling in f(G,T) gravity

IF 1.9 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Astronomy and Computing Pub Date : 2024-08-26 DOI:10.1016/j.ascom.2024.100865

M. Sharif, K. Hassan

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引用次数: 0

Abstract

This paper aims to formulate anisotropic cosmological solution of a non-static spherical structure with the help of gravitational decoupling scheme through minimal geometric deformation in $f (G, T)$ gravity. This technique transforms only the radial metric function while the temporal component remains unchanged. Consequently, the field equations are separated into two independent arrays: one is related to the seed source and the other characterizes the extra sector. In order to derive the solution corresponding to the isotropic sector, we use the Friedmann–Lemaitre–Robertson–Walker cosmic model and employ the barotropic equation of state as well as power-law model. Finally, we study the impact of decoupling parameter to describe different eras of the universe through graphical analysis. It is found that physically viable and stable trends of the resulting solution are achieved for both radiation-dominated as well as matter-dominated epochs in this modified theory.

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通过 f(G,T) 引力解耦的宇宙学解决方案

本文旨在借助引力解耦方案，通过 f(G,T) 引力的最小几何变形，提出非静态球形结构的各向异性宇宙学解法。这种技术只变换径向度量函数，而时间分量保持不变。因此，场方程被分成了两个独立的阵列：一个与种子源有关，另一个描述了额外扇区的特征。为了得出与各向同性扇区相对应的解，我们使用了弗里德曼-勒梅特尔-罗伯逊-沃克宇宙模型，并采用了各向同性状态方程和幂律模型。最后，我们通过图形分析研究了去耦参数对描述宇宙不同时代的影响。研究发现，在这一修正理论中，无论是辐射主导还是物质主导的时代，所得到的解都具有物理上可行且稳定的趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astronomy and Computing ASTRONOMY & ASTROPHYSICSCOMPUTER SCIENCE,-COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

CiteScore

4.10

自引率

8.00%

发文量

期刊介绍： Astronomy and Computing is a peer-reviewed journal that focuses on the broad area between astronomy, computer science and information technology. The journal aims to publish the work of scientists and (software) engineers in all aspects of astronomical computing, including the collection, analysis, reduction, visualisation, preservation and dissemination of data, and the development of astronomical software and simulations. The journal covers applications for academic computer science techniques to astronomy, as well as novel applications of information technologies within astronomy.