One of the most important issues in modern cosmology is understanding the origin of the accelerated expansion of the universe, known as “dark energy”. The scalar–tensor model is one of the most interesting candidates for describing dark energy. In this paper, we investigate the non-canonical scalar model, which is written in the framework of Chameleon models. In this model, the scalar field is coupled to a mass density ρm under an arbitrary g(ϕ) coupling function. We study the cosmological aspect of this model according to its Chameleon state and we conclude that for high densities, the mass of the Chameleon field becomes larger, so its effect will not be seen in high-density areas. We also examine the dynamical behavior of this model for different coupling functions and potentials. According to the dynamic behavior of the model, we can conclude that using this model can explain the accelerated expansion of the universe. Finally, we investigate the tensor perturbations in this model and show that the mass of the gravitational waves obtained in the framework of this model can be in good agreement with the observations.

中文翻译：

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非经典变色龙宇宙学

现代宇宙学中最重要的问题之一是了解宇宙加速膨胀的起源，即所谓的“暗能量”。标量张量模型是描述暗能量的最有趣的候选者之一。在本文中，我们研究了在变色龙模型框架中编写的非规范标量模型。在这个模型中，标量场与质量密度耦合ρ米在任意G(φ)耦合功能。我们根据它的变色龙状态研究这个模型的宇宙学方面，我们得出结论，对于高密度，变色龙场的质量变大，因此在高密度区域不会看到它的影响。我们还检查了该模型在不同耦合函数和电位下的动力学行为。根据模型的动力学行为，我们可以得出结论，使用该模型可以解释宇宙的加速膨胀。最后，我们研究了该模型中的张量扰动，表明在该模型的框架下获得的引力波质量与观测值可以很好地吻合。