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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2204.07599gr-qc
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$f(R,T)$引力场中参数化暗能量模型的动力学

Dynamics of a parametrized dark energy model in $f(R,T)$ gravity

J. K. Singh, Akanksha Singh, G. K. Goswami, J. Jena

摘要:

研究了$f(R,T)$ -引力中的一个平坦FLRW模型,它包含标量曲率的二次变化$R$和应力能量张量$T$迹的线性项.反过来,我们建立的模型具有晚期宇宙的行为,它加速膨胀并最终形成一个大裂缝。利用比例因子$a(t)$的参数化,我们提出了一个模型,它从点型奇异性开始,即,该模型从零体积、无限能量密度和无限温度的点开始。该模型的行为目前正在加速扩展,$Λ$ CDM也在后期发展。最后,该模型表现得像一个经典的暗能量模型在目前的时间和标准宇宙学$Λ$ CDM在后期是一致的。

英文摘要:

We investigate a flat FLRW-model in $f(R,T)$-gravity, which includes the quadratic variation in scalar curvature $R$ and the linear term of the trace of the stress-energy tensor $T$. In turn, we establish the model has the behaviour of the late time Universe, which is accelerated expanding and ends up in a big rip. Using the parametrization of scale factor $a(t)$, we propose a model, which begins with point-type singularity, i.e., the model starts with a point of zero volume, infinite energy density and infinite temperature. The model's behaviour is accelerated expanding at present and $Λ$CDM in late times. Finally, the proposed model behaves like a quintessence dark energy model in the present time and is consistent with standard cosmology $Λ$CDM in late times.

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