具有各向异性背景的$f(R,G)$重力中的能量界

M. Shamir, Ayesha Komal
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引用次数: 10

摘要

本文研究了各向异性背景下修正高斯-邦纳重力的能量界。$f(R,G)$重力下的局部旋转对称的Bianchi型${I}$宇宙学模型被认为满足这一目标。首先,一般的$f(R,G)$模型被用来建立场方程。在这方面,我们通过研究能量条件来考察修正引力理论的可行性。我们考虑了文献中常用的四种f(R,G)$重力模型。我们给出了由能量条件得到的不等式,并利用哈勃、减速、猛跳和snap参数考察了上述模型的可行性。图形分析表明,对于前两个$f(R,G)$重力模型,在适当的各向异性值和模型参数下,满足NEC、WEC和SEC。此外,第三和第四种预测宇宙膨胀的模型违背了SEC。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Energy Bounds in $f(R,G)$ Gravity with Anisotropic Background
This paper investigates the energy bounds in modified Gauss-Bonnet gravity with anisotropic background. Locally rotationally symmetric Bianchi type ${I}$ cosmological model in $f(R,G)$ gravity is considered to meet this aim. Primarily, a general $f(R,G)$ model is used to develop the field equations. In this aspect, we investigate the viability of modified gravitational theory by studying the energy conditions. We take in account four $f(R,G)$ gravity models commonly discussed in the literature. We formulate the inequalities obtained by energy conditions and investigate the viability of the above mentioned models using the Hubble, deceleration, jerk and snap parameters. Graphical analysis shows that for first two $f(R,G)$ gravity models, NEC, WEC and SEC are satisfied under suitable values of anisotropy and model parameters involved. Moreover, SEC is violated for the third and fourth models which predicts the cosmic expansion.
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