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Interacting generalized ghost dark energy in a non-flat universe |
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| Authors: | Esmaeil Ebrahimi Ahmad Sheykhi Hamzeh Alavirad |
| Institution: | 1. Department of Physics, Shahid Bahonar University, PO Box 76175, Kerman, Iran 3. Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), PO Box 55134-441, Maragha, Iran 2. Physics Department and Biruni Observatory, College of Sciences, Shiraz University, Shiraz, 71454, Iran 4. Institute for Theoretical Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany |
| 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. |
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