各向异性宇宙$f(\mathcal{G},\textit{T})$重力

M. Shamir
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引用次数: 7

摘要

本文致力于研究最近引入的$f(\mathcal{G},\textit{T})$引力理论,其中$\mathcal{G}$是高斯-博内项,${\textit{T}}$是能量-动量张量的轨迹。为此,选择各向异性背景,采用幂律$f(\mathcal{G},\textit{T})$重力模型求场方程的精确解。特别地,得到了一个通解,该通解进一步用于重建宇宙学背景下的一些重要解。计算了能量密度、压力、状态方程参数等物理量。提出了一个类似于Starobinsky $f_2(\textit{T})$的模型,用于分析宇宙在不同状态方程参数值下的行为。结果表明,在二元函数$f(\mathcal{G},\textit{T})$中存在项$\textit{T}$可以给出许多具有宇宙学意义的场方程解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Anisotropic Universe in $f(\mathcal{G},\textit{T})$ Gravity
This paper is devoted to investigate the recently introduced $f(\mathcal{G},\textit{T})$ theory of gravity, where $\mathcal{G}$ is the Gauss-Bonnet term, and ${\textit{T}}$ is the trace of the energy-momentum tensor. For this purpose, anisotropic background is chosen and a power law $f(\mathcal{G},\textit{T})$ gravity model is used to find the exact solutions of field equations. In particular, a general solution is obtained which is further used to reconstruct some important solutions in cosmological contexts. The physical quantities like energy density, pressure, and equation of state parameter are calculated. A Starobinsky Like $f_2(\textit{T})$ model is proposed which is used to analyze the behavior of universe for different values of equation of state parameter. It is concluded that presence of term $\textit{T}$ in the bivariate function $f(\mathcal{G},\textit{T})$ may give many cosmologically important solutions of the field equations.
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