G-essence with Yukawa interactions

Abstract

We study the g-essence model with Yukawa interactions between a scalar field φ and a Dirac field ψ. For the homogeneous, isotropic and flat Friedmann-Robertson-Walker universe filled with the such g-essence, the exact solution of the model is found. Moreover, we reconstruct the corresponding scalar and fermionic potentials which describe the coupled dynamics of the scalar and fermionic fields. It is shown that some particular g-essence models with Yukawa interactions correspond to the usual and generalized Chaplygin gas unified models of dark energy and dark matter. Also we present some scalar-fermionic Dirac-Born-Infeld models corresponding g-essence models with Yukawa interactions which again describe the unified dark energy-dark matter system.

Cosmological Evolution of Equation of State for Dark Energy in G-Essence Models

“…Several properties of g-essence have been studied in Refs. [71][72][73][74]. We remark that the model (2.1) can also describe k-essence and f-essence, as is shown in the following next subsections.…”

FRW and Bianchi type I cosmology of f-essence

“…The Mixmaster universe exhibits similar properties as the Kasner solution. Some properties of g-essence were studied in Kulnazarov et al (2011. Model (1) admits two important reductions: k-essence and f -essence.…”

Analysis cosmological tachyon and fermion model and observation data constraints

“…At present, there are many models of dark energy and any of them can be used to describe the dynamics of the universe [22][23][24][25][26][27][28][29]. Some of these models are based on scalar fields and some of them are similar to inflationary models [30][31][32][33] or based on fermionic fields [34][35][36][37][38][39][40][41][42][43][44][45]. Particularly, it was shown, that the fermion field plays a crucial role in the isotropization of the initially anisotropic space-time, the formation of a free singularity of cosmological solutions, and the explanation of the late acceleration time.…”