Interacting generalized ghost dark energy in a non-flat universe

2012/09/30 by Esmaeil Ebrahimi, Ahmad Sheykhi, Hamzeh Alavirad · 12 citations
Physics and Astronomy · #Astrophysics #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #De Sitter universe #Deceleration parameter #Equation of state #Friedmann–Lemaître–Robertson–Walker metric #Galaxies: Formation, Evolution, Phenomena #Mathematical physics #Metric expansion of space #Physics #Quantum chromodynamics #Quantum mechanics #Shape of the universe #Universe #gr-qc

paper · pdf · doi:10.2478/s11534-013-0253-x

published in Open Physics 11(7) (De Gruyter Open) · 14 Pages, 10figures

openalex publication_date 2013/01/01 · arxiv created 2013/06/27 · arxiv updated 2015/06/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Abstract We investigate the generalized Quantum Chromodynamics (QCD) ghost model of dark energy in the framework of Einstein gravity. First, we study the non-interacting generalized ghost dark energy in a flat Friedmann-Robertson-Walker (FRW) background. We obtain the equation of state parameter, w D = p/ρ, the deceleration parameter, and the evolution equation of the generalized ghost dark energy. We find that, in this case, w D cannot cross the phantom line (w D > −1) and eventually the universe approaches a de-Sitter phase of expansion (w D → −1). Then, we extend the study to the interacting ghost dark energy in both a flat and non-flat FRW universe. We find that the equation of state parameter of the interacting generalized ghost dark energy can cross the phantom line (w D < −1) provided the parameters of the model are chosen suitably. Finally, we constrain the model parameters by using the Markov Chain Monte Carlo (MCMC) method and a combined dataset of SNIa, CMB, BAO and X-ray gas mass fraction.

Citations

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