研究 Weyl 型 $f(Q,T)$ 引力中精确解与观测数据的相容性
Investigating the compatibility of exact solutions in Weyl-type $f(Q,T)$ gravity with observational data
AI总结:
本文在 Weyl 型 $f(Q,T)$ 引力中推导尘埃宇宙的精确幂律解,并利用 Hubble、Pantheon 数据约束参数,证明该理论可无需暗能量解释晚期加速。
摘要:
在本研究中,我们在 Weyl 型 $f(Q,T)$ 理论框架内考察宇宙在观测到的晚期加速阶段期间的动力学。具体而言,我们考虑一个具有充分动机的模型,其函数形式为 $f(Q,T)=αQ+\ rac{β}{6κ^2}T$,其中 $Q$ 表示非度规性标量,$T$ 表示能量-动量张量的迹。在此背景下,时空的非度规性 $Q_{μαβ}$ 由向量场 $w_μ$ 建立。参数 $α$ 和 $β$ 支配引力场及其与宇宙物质组分的相互作用。通过考虑尘埃物质情形,我们获得场方程的精确解,并观测到哈勃参数 $H(z)$ 关于红移 $z$ 遵循幂律行为。为约束模型参数,我们分析了多个数据集,包括 $Hubble$、$Pantheon$ 数据集及其组合。我们的结果表明,Weyl 型 $f(Q,T)$ 理论提供了一种可行的替代方案,可在不使用暗能量的情况下解释观测到的宇宙晚期加速。
英文摘要:
In this study, we investigate the dynamics of the Universe during the observed late-time acceleration phase within the framework of the Weyl-type $f(Q,T)$ theory. Specifically, we consider a well-motivated model with the functional form $f(Q,T)=αQ+\frac{β}{6κ^2}T$, where $Q$ represents the scalar of non-metricity and $T$ denotes the trace of the energy-momentum tensor. In this context, the non-metricity $Q_{μαβ}$ of the space-time is established by the vector field $w_μ$. The parameters $α$ and $β$ govern the gravitational field and its interaction with the matter content of the Universe. By considering the case of dust matter, we obtain exact solutions for the field equations and observe that the Hubble parameter $H(z)$ follows a power-law behavior with respect to redshift $z$. To constrain the model parameters, we analyze various datasets including the $Hubble$, $Pantheon$ datasets, and their combination. Our results indicate that the Weyl-type $f(Q,T)$ theory offers a viable alternative to explain the observed late-time acceleration of the Universe avoiding the use of dark energy.
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