论文标题
使用类星体和$ h（z）$ data约束非最小耦合$ f（q）$ cesmology中的限制广义chaplygin气
Constraining Generalized Chaplygin Gas in Non-Minimally Coupled $f(Q)$ Cosmology using Quasars and $H(z)$ Data
论文作者
论文摘要
在爱因斯坦方程的当前框架中，重力是通过时空曲率描述的。但是，还有其他描述可以通过扭转和非金属$ q $来理解重力的起源。在这项工作中，我们讨论了重力的修改理论，即$ f（q）$重力，该理论考虑了$ q $的非线性扩展。特别是，我们研究了它与重要的情况下无限制地耦合的情况。由Chaplygin气体模型在深色能源解释中的最新成功的推动下，我们假设无需加压的Baryonic物质和广义的Chaplygin气体作为背景流体。我们使用两个不同的数据集约束所提出的模型：一个用于哈勃测量值，另一个用于用马尔可夫链蒙特卡洛（MCMC）方法校准的类星体（我们对其进行校准）。我们采用运动学工具（例如减速和混蛋参数）来确定$λ$ CDM的偏差。我们确定在减速参数$ Q $中的过渡红移$ z_t $分别为$ 0.607 $和$ 0.204 $，因此有两个数据集，因此描述了宇宙的加速度。
In the current framework of Einstein's equations in general relativity (GR), gravity is described by the spacetime curvature. However, there are other descriptions where the origin of gravity can be understood through torsion and non-metricity $Q$. In this work, we discuss a modified theory of gravity namely $f(Q)$ gravity, which considers a non-linear extension of $Q$. In particular, we study the case where it is non-minimally coupled to matter. Motivated by the recent success of Chaplygin gas models in the explanation of dark energy, we assume a pressureless baryonic matter and a generalized Chaplygin gas as the background fluid. We constrain the proposed model using two different datasets: one for Hubble measurements and the other for quasars (which we calibrated) with Markov-Chain Monte Carlo (MCMC) methods. We employ kinematic tools such as deceleration and jerk parameters to determine deviations of the proposed model from $Λ$CDM. We establish that the transition redshift $z_T$ in the deceleration parameter $q$ is $0.607$ and $0.204$ with the two datasets respectively, therefore describing the universe's acceleration.
