Ghost Condensates and Pure Kinetic k-Essence Condensates in the Presence of Field–Fluid Non-Minimal Coupling in the Dark Sector

In this article, we try to determine 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 fin...

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Published inUniverse (Basel) Vol. 9; no. 2; p. 65
Main Authors Hussain, Saddam, Chatterjee, Anirban, Bhattacharya, Kaushik
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.02.2023
Subjects
Condensates
Cosmology
Dark energy
Dark matter
Expanding universe theory
ghost condensate
Gravity
non-minimal coupling
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Summary:In this article, we try to determine 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.
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ISSN:2218-1997
2218-1997
DOI:10.3390/universe9020065