Ghost condensates and pure kinetic $k$-essence condensates in presence of field-fluid non-minimal coupling in the dark sector

Abstract

In this article we try to find out the conditions when a ghost field in conjunction with a barotropic fluid produces a stable accelerating expansion phase of the universe. It is seen that in many cases the ghost field produces a condensate and drives the fluid energy density to zero in the final accelerating phase, but there can be other possibilities. We have shown that a pure kinetic $k$-essence field (which is not a ghost field) interacting with a fluid can also form an interaction induced condensate and produce a stable accelerating phase of the universe. In the latter case the fluid energy density does not vanish in the stable phase.

Corrected and modified version. 25 pages, Accepted for publication in Universe

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Cited by in corpus (13)

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• Dynamics of viable $f(R)$ dark energy models in the presence of Curvature-Matter interactions
• Interacting Models of Dark Energy and Dark Matter in Einstein scalar Gauss Bonnet Gravity
• Dynamical analysis of coupled curvature-matter scenario in viable $f(R)$ dark energy models at de Sitter phase
• Phase-space analysis of torsion-coupled dilatonic ghost condensate
• NEC violation in $f(\bar{R},\bar{T})$ gravity in the context of a non-canonical theory via modified Raychaudhuri equation
• Exploring the evolution of structure growth in the universe with field-fluid interactions through dynamical stability analysis
• Observational constraints on generic models of non-minimal curvature-matter coupling
• End equilibrium state of a spherical gravitational collapse in the presence of matter and scalar field
• Realizing late-time cosmology in the context of Dynamical Stability Approach
• A comprehensive dynamical and phenomenological analysis of structure growth in curvature-modulated coupled quintessence scenario
• Non-minimal coupling of scalar fields in the dark sector and generalization of the top-hat collapse
• Observational and Thermodynamic aspects of one-dimensional Dark Energy EoS parametrization models