论文标题
$ f（q）$重力中哈勃参数的新参数化
A new parametrization of Hubble parameter in $f(Q)$ gravity
论文作者
论文摘要
在本文中，我们在$ f \ left（q \右）$重力理论的框架中研究了宇宙的加速扩展，其中非金属标量$ q $描述了重力相互作用。为此，我们使用独立于模型的方式提出了哈勃参数的新参数化，并将其应用于FLRW宇宙中的Friedmann方程。然后，我们通过使用由$ 57 $的$ 57 $组成的更新的$ H（z）$的组合数据集估计模型参数的最佳拟合值。减速参数的演变表明从减速到宇宙加速阶段的过渡。此外，我们研究了态被分析和OM诊断参数的行为，此外，为了讨论其他宇宙学参数，我们考虑了$ f \ left（q \右）$ \模型，具体来说，$ f \ left（q \ right）= q+mq^{n} $，其中$ m $和$ n $是免费参数。最后，我们发现该模型支持当前的加速宇宙，并且EOS参数的行为类似于典型模型。
In this paper, we examine the accelerated expansion of the Universe at late-time in the framework of $f\left( Q\right) $ gravity theory in which the non-metricity scalar $Q$ describes the gravitational interaction. To this, we propose a new parametrization of the Hubble parameter using a model-independent way and apply it to the Friedmann equations in the FLRW Universe. Then we estimate the best fit values of the model parameters by using the combined datasets of updated $H(z)$ consisting of $57$ points, the Pantheon consisting of $1048$ points, and BAO datasets consisting of six points with the Markov Chain Monte Carlo (MCMC) method. The evolution of deceleration parameter indicates a transition from the deceleration to the acceleration phase of the Universe. In addition, we investigate the behavior of statefinder analysis and Om diagnostic parameter, Further, to discuss other cosmological parameters, we consider a $f\left( Q\right) $\ model, specifically, $f\left( Q\right) =Q+mQ^{n}$, where $m$ and $n$ are free parameters. Finally, we find that the model supports the present accelerating Universe, and the EoS parameter behaves like the quintessence model.
