Cosmology with interaction between phantom dark energy and dark matter and the coincidence problem

By R. Cai, Anzhong Wang. 2004

319 citations recorded by the source corpus.

We study a cosmological model in which phantom dark energy is coupled to dark matter by phenomenologically introducing a coupled term to the equations of motion of dark energy and dark matter. This term is parameterized by a dimensionless coupling function δ, the Hubble parameter and the energy density of dark matter, and it describes an energy flow between the dark energy and dark matter. We discuss two cases: one is the case where the equation of state ωe of the dark energy is a constant; the other is that where the dimensionless coupling function δ is a constant. We investigate the effect of the interaction on the evolution of the universe, the total lifetime of the universe and the ratio of the period when the universe is in the coincidence state to its total lifetime. It turns out that the interaction will produce significant deviation from the case without the interaction.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5599bcb9123caad05c5561f6dfe86c9b8a5e7e12

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Citations in the corpus

Holographic dark energy (2016, methodology): “Theoretical Studies for The IHDE Model The DE/DM interactions were first introduced to justify the currently small value of the cosmological constant [278, 279]; afterwards they were found to be very useful to alleviate the coincidence problem [280, 281, 282, 283].”
Interacting scenarios with dynamical dark energy: Observational constraints and alleviation of the H0 tension (2019, unknown): “However, later on it was found that it could also alleviate the cosmic coincidence problem in a natural way [6, 7, 8, 9, 10, 11] , and this led to many investigations of interacting cosmology [12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,”
Exotic solutions in General Relativity: Traversable wormholes and 'warp drive' spacetimes (2007, background): “A simple way to parameterize the dark energy is by an equation of state of the form ω ≡ p/ρ, where p is the spatially homogeneous pressure and ρ the energy density of the dark energy [153].”