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arXiv 1707.01360gr-qc
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$f(R,T)$宇宙学中最简单的非极小物质-几何耦合

The simplest non-minimal matter-geometry coupling in the $f(R,T)$ cosmology

P. H. R. S. Moraes, P. K. Sahoo

摘要:

$f(R,T)$引力理论是一种推广的引力理论,它的引力作用量包含了Ricci标量$R$和能量动量张量$T$的迹的通项。以这种方式,$f(R,T)$模型能够描述几何形状(通过$R$中的项)和物质(通过$T$中的项)之间的非最小耦合。在这篇文章中,我们从$f(R,T)$引力形式体系中最简单的非最小物质-几何耦合出发,通过一个有效的能量-动量张量,由通常的物质能量-动量张量与暗能量贡献之和给出,后者来自物质-几何耦合项。我们将能量条件应用于我们的解决方案,以获得模型的自由参数的一系列值,从而产生健康和良好的场景。对于服从能量条件应用的自由参数的某些值,有可能预测宇宙从膨胀的减速期到加速期(暗能量时代)的过渡。我们还提出了进一步的应用程序的这种特殊情况下的$f(R,T)$形式主义,以检查其可靠性在其他领域,而不是宇宙学。

英文摘要:

The $f(R,T)$ gravity is an extended theory of gravity in which the gravitational action contains general terms of both the Ricci scalar $R$ and trace of the energy-momentum tensor $T$. In this way, $f(R,T)$ models are capable of describing a non-minimal coupling between geometry (through terms in $R$) and matter (through terms in $T$). In this article we construct a cosmological model from the simplest non-minimal matter-geometry coupling within the $f(R,T)$ gravity formalism, by means of an effective energy-momentum tensor, given by the sum of the usual matter energy-momentum tensor with a dark energy contribution, with the latter coming from the matter-geometry coupling terms. We apply the energy conditions to our solutions in order to obtain a range of values for the free parameters of the model which yield a healthy and well-behaved scenario. For some values of the free parameters which are submissive to the energy conditions application, it is possible to predict a transition from a decelerated period of the expansion of the universe to a period of acceleration (dark energy era). We also propose further applications of this particular case of the $f(R,T)$ formalism in order to check its reliability in other fields, rather than cosmology.

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