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Probing cosmic acceleration in $$\kappa (R,T)$$ κ ( R , T ) gravity
Indian Journal of Physics ( IF 1.6 ) Pub Date : 2021-01-04 , DOI: 10.1007/s12648-020-01948-4
Nasr Ahmed , Anirudh Pradhan

This paper reveals about a stable flat cosmological model which has been constructed, and the evolution of dark energy has been investigated in the framework of the recently suggested non-Lagrangian \(\kappa (R,T)\) modified gravity (Terule, Eur Phys J C 78:660, 2018). The toy model we are presenting in the current work reveals some interesting cosmological features consistent with observations and the standard \(\Lambda \)CDM model. The evolution of cosmic pressure shows a positive-to-negative transition corresponding to the cosmic deceleration–acceleration transition. Both the deceleration parameter and the cosmic pressure have the positive-to-negative sign flipping. While this behavior can provide explanation for the deceleration–acceleration transition, the reason behind this positive-negative transition itself is still missing. The current model implies a very small positive value for the cosmological constant which also agrees with observations.



中文翻译:

在$$ \ kappa(R,T)$$κ(R,T)重力中探测宇宙加速度

本文揭示了一个已建立的稳定的平面宇宙学模型,并在最近提出的非拉格朗日\(\ kappa(R,T)\)修正引力(Terule,Eur 的框架下研究了暗能量的演化Phys JC 78:660,2018)。我们在当前工作中展示的玩具模型揭示了一些有趣的宇宙学特征,这些特征与观测结果和标准\(\ Lambda \)一致CDM模型。宇宙压力的演化显示出正负过渡,对应于宇宙减速-加速过渡。减速参数和宇宙压力都具有正负符号翻转。尽管这种行为可以为减速-加速过渡提供解释,但这种正负过渡本身背后的原因仍然缺失。当前模型暗示宇宙常数的极小正值,这也与观察结果一致。

更新日期:2021-01-05
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