论文标题
$ f（q，t）$ gravity中的广义chaplygin气体和加速宇宙
Generalized Chaplygin gas and accelerating universe in $f(Q,T)$ gravity
论文作者
论文摘要
具有不寻常的状态液体方程式的广义Chaplygin气体（GCG）是暗能量的另一个有前途的候选人。我们研究了GCG方案，再加上新建议的$ f（q，t）$ gravity，非金属$ q $的任意功能以及能量巨头张量$ t $的痕迹。我们将$ f（q，t）$的功能形式视为$ q $的线性组合和$ t $的任意功能，以$ h（t）$表示。此外，我们在高压和高密度方案下获得了$ f（q，t）$模型的两种不同的功能形式。我们还使用1048个数据点，31点的哈勃数据集和Baryon声学振荡的最近的万神殿超新星数据集测试了每个模型。减速参数是使用$ ohd+sneia+bao $构建的，预测从减速到宇宙扩展的加速阶段的过渡。同样，状态参数方程也获得了描述加速度的负面行为。最后，我们分析了状态基诊断，以区分GCG和其他暗能量模型。
The generalized Chaplygin gas (GCG), which has an unusual perfect fluid equation of state, is another promising candidate for dark energy. We investigate the GCG scenario coupled with a baryonic matter in a newly suggested $f(Q,T)$ gravity, an arbitrary function of non-metricity $Q$ and the trace of energy-momentum tensor $T$. We consider the functional form of $f(Q, T)$ as a linear combination of $Q$ and an arbitrary function of $T$, denoted by $h(T)$. Furthermore, we obtain two different functional forms of the $f(Q,T)$ model under high pressure and high-density scenarios of GCG. We also test each model with the recent Pantheon supernovae data set of 1048 data points, Hubble data set of 31 points, and baryon acoustic oscillations. The deceleration parameter is constructed using $OHD+SNeIa+BAO$, predicting a transition from decelerated to accelerated phases of the universe expansion. Also, the equation of state parameter acquires a negative behavior depicting acceleration. Finally, we analyze the statefinder diagnostic to discriminate between the GCG and other dark energy models.
