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arXiv 2107.02889gr-qc
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共形平坦(GR)4如何影响高斯-博内引力?

How a conformally flat (GR)4 impacts Gauss-Bonnet gravity?

Avik De, Tee-How Loo, Raja Solanki, P. K. Sahoo

摘要:

首先,我们证明了四维共形平坦的广义Ricci递归时空$(GR)_4$是一个Einstein流形。我们研究这样的时空作为一个解决方案的$f(R, G)$ -引力理论,它表明,从修改的引力扇区的附加条款可以表示为一个完美的流体。用$f(R, G) = R +\sqrt{G}$和$f(R, G) = R^2+GlnG$研究了几种能量条件。对于这两个模型,弱能、零能和主能条件都得到了满足,但强能条件都被破坏了,这与最近的观测研究结果一致,即当前宇宙处于加速阶段.

英文摘要:

First and foremost, we show that a 4-dimensional conformally flat generalized Ricci recurrent spacetime $(GR)_4$ is an Einstein manifold. We examine such a spacetime as a solution of $f(R, G)$-gravity theory and it is shown that the additional terms from the modification of the gravitational sector can be expressed as a perfect fluid. Several energy conditions are investigated with $f(R, G) = R +\sqrt{G}$ and $f(R, G) = R^2+GlnG$. For both the models, weak, null and dominant energy conditions are satisfied while strong energy condition is violated, which is a good agreement with the recent observational studies which reveals that the current universe is in accelerating phase.

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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