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arXiv 2204.07604gr-qc
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$f(R)$引力中的曲率主导DE模型

Curvature dominance DE-model in $f(R)$-gravity

G. K. Goswami, Rita Rani, Harshna Balhara, J. K. Singh

AI总结:

本研究在$f(R)$引力框架下提出标量曲率$R$的三次曲率主导暗能量模型,经观测数据验证其晚期演化与$\Lambda$CDM模型一致,可解释宇宙加速膨胀。

摘要:

我们探究了$f(R)$引力框架下的一个宇宙学模型,该模型是关于标量曲率$R$的三次方程。由非线性$f(R)$函数产生的项被视为源于曲率诱导几何的能量。研究结果显示,该模型下宇宙呈现加速膨胀,会在宇宙中产生反引力的负压效应。我们通过数值方法求解了部分物理参数。利用最新的观测哈勃数据(46个数据点)以及Pantheon数据(最新的Ia型超新星汇编数据,包含40个分箱数据,红移范围为$0.014 \leqslant z \leqslant1.62$),我们检验了该模型的演化过程。通过分析各类动力学参数的图像,我们讨论了该模型的若干重要特征。减速参数$q$和哈勃参数$H$的图像表明,当前时期宇宙的演化处于加速膨胀阶段。我们的模型中,宇宙从减速膨胀过渡到加速膨胀的红移值为$z_{tr} \simeq 0.694069$,这与$\Lambda$CDM模型的结果高度吻合。我们还对该模型开展了状态 finder 分析。对模型特定特征的分析证实,我们的模型在晚期演化阶段与$\Lambda$CDM模型具有一致性。

英文摘要:

We have probed a cosmological model in $f(R)$-gravity, which is a cubic equation in scalar curvature $R$. The terms arise due to nonlinear $f(R)$ function are treated as energy due to curvature inspired geometry. As a result, we find accelerating expansion in the universe, which creates an anti-gravitating negative pressure in it. Some of the physical parameters are solved using numerical methods. The evolution of the model are examined by the latest observational Hubble data (46-data points) and Pantheon data (the latest compilation of SNIa with 40 binned in the redshift range $0.014 \leqslant z \leqslant1.62$). Some important features of the model have been discussed by analyzing the plots of various dynamical parameters. The plots of deceleration parameter $q$ and the Hubble parameter $H$ describe the accelerating expansion in the evolution of the Universe at the present epoch. The transition from deceleration to acceleration for our model is obtained at redshift $z_{tr} \simeq 0.694069$, which is in good agreement with $Λ$CDM. We have also carried out state finder analysis for our model. The analysis of specific features of the model confirms that our model is consistent with $Λ$CDM in late times.

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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