In this paper, we study the essence of f(R,T) gravitation theory in five-dimensional Universe and see the role of dark energy in the form of wet dark fluid in a Kaluza–Klein Universe. It is found that the dark energy is not exaggerated in contributing to the accelerating expansion of the Universe though the expansion is inherent as a result of the theory itself and due to the geometric contribution of matter. It is interesting to see that in some model it is found that there was some era before the beginning of the present era. Some of the models are seen to go to ΛCDM models in late future as in Einstein gravitation theory, starting the evolution with a big bang. Most of the models undergo early inflation as well as late-time accelerating expansion thus defining as good models for real astrophysical situations, with dark energy playing fundamental role in these Universe. Most interesting observation from this investigation is that we can developed new isotropic and anisotropic models of Kaluza–Klein Universe.

中文翻译：

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Kaluza-Klein 宇宙在 f(R,T) 引力下与湿暗流体相互作用

在本文中，我们研究了F(R,吨)五维宇宙中的引力理论，并了解暗能量在 Kaluza-Klein 宇宙中以湿暗流体形式的作用。人们发现暗能量对宇宙加速膨胀的贡献并没有被夸大，尽管膨胀是理论本身和物质的几何贡献所固有的结果。有趣的是，在某些模型中发现在当前时代开始之前存在某个时代。一些模型被视为去Λ未来的 CDM 模型，如爱因斯坦引力理论中的模型，以大爆炸开始进化。大多数模型都经历了早期的膨胀和晚期的加速膨胀，因此被定义为真实天体物理情况的良好模型，暗能量在这些宇宙中发挥着重要作用。这项调查中最有趣的观察结果是，我们可以开发新的 Kaluza-Klein 宇宙各向同性和各向异性模型。