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arXiv 2302.05070gr-qc
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Weyl型$f(Q,T)$引力状态方程参数的暗能量约束

Dark energy constraint on equation of state parameter in the Weyl type $f(Q,T)$ gravity

Gaurav N. Gadbail, Simran Arora, P. K. Sahoo

摘要:

状态方程参数是表征暗能量模型的重要方法。我们使用贝叶斯分析最近的观测数据集(宇宙天文台数据(CC)和万神殿样本)的状态方程参数的红移的演变。有效状态方程参数$ω_{eff}=ω_0+ω_a \left( \frac{z}{1+z}\right) $($ω_0$和$ω_a$为自由常数)的Chevallier-Polarski-Linder参数化仅限于Weyl型$f(Q,T)$引力,其中$Q$表示非度规性,$T$为能量动量张量的迹.我们观察到的减速参数$q$,密度参数$ρ$,压力$p$,和有效状态方程参数$ω$的演变。$ω$的宇宙数据限制并不排除$ω< -1$的可能性。可以看出,参数$ω$示出了从减速到加速的转变,以及从$ω>-1$到$ω<-1$的转变。

英文摘要:

The equation of state parameter is a significant method for characterizing dark energy models. We investigate the evolution of the equation of state parameter with redshift using a Bayesian analysis of recent observational datasets (the Cosmic Chronometer data (CC) and Pantheon samples). The Chevallier-Polarski-Linder parametrization of the effective equation of state parameter, $ω_{eff}=ω_0+ω_a \left( \frac{z}{1+z}\right) $, where $ω_0$ and $ω_a$ are free constants, is confined to the Weyl type $f(Q,T)$ gravity, where $Q$ represents the non-metricity and $T$ is the trace of the energy-momentum tensor. We observe the evolution of the deceleration parameter $q$, the density parameter $ρ$, the pressure $p$, and the effective equation of state parameter $ω$. The cosmic data limit for $ω$ does not exclude the possibility of $ω< -1$. It is seen that the parameter $ω$ shows a transition from deceleration to acceleration, as well as a shift from $ω>-1$ to $ω<-1$.

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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