The Modified Chaplygin Gas (MCG) model belongs to the class of a unified models of dark energy and dark matter. In this paper, we have modeled MCG in the framework of f-essence cosmology. By constructing an equation connecting the MCG and the f-essence, we solve it to obtain explicitly the pressure and energy density of MCG. As special cases, we obtain both positive and negative pressure solutions for suitable choices of free parameters. We also calculate the state parameter which describes the phantom crossing.
Motivated by an earlier work on fractional-action cosmology with a periodic weight function [1], we extend it by choosing a power-law weight function in the action. In this approach, we obtain a varying gravitational coupling constant. We then model dark energy in this paradigm and obtain relevant cosmological parameters.
Ê Ú ¼ Ù Ù×Ø ¾¼½½ ÔØ ½½ ÇØÓ Ö ¾¼½½ ×ØÖ ØIn this paper, we have considered the g-essence and its particular cases, k-essence and f-essence, within the framework of the Einstein-Cartan theory. We have shown that a single fermionic field can give rise to the accelerated expansion within the Einstein-Cartan theory.
In this work, some new integrable and nonintegrable cosmological models of the Hořava-Lifshitz gravity are proposed. For some of them, exact solutions are presented. Then these results extend for the F(R) Hořava-Lifshitz gravity theory case. In particular, several integrable cosmological models of this modified gravity theory were constructed in the explicit form.
We study the two particular models of g-essence with Yukawa type interactions between a scalar field φ and a classical Dirac field ψ. For the homogeneous, isotropic and flat FriedmannRobertson-Walker universe filled with the such g-essence, some exact solutions of these models are found. Moreover, we reconstruct the corresponding scalar and fermionic potentials.
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