The Unified Equation of State for Dark Matter and Dark Energy

Abstract

We assume that dark matter and dark energy satisfy the unified equation of state: $p=B(z)\rho$, with $p=p_{dE}$, $\rho ={\rho }_{dm}+{\rho }_{dE}$, where the pressure of dark matter $p_{dm}=0$ has been taken into account. A special function $B=-\frac{A}{(1+z{)}^{\alpha }}$ is presented, which can well describe the evolution of the universe. In this model, the universe will end up with a Big Rip. By further simple analysis, we know other choices of the function $B$ can also describe the universe but lead to a different doomsday.

arXiv comment7 pages, 3 figures, ws-mpla.cls, accepted by MPLA

References in corpus (5)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Quantum escape of sudden future singularity
• The Revival of the Unified Dark Energy-Dark Matter Model ?
• Phantom thermodynamics

Cited by in corpus (5)

• Perturbations of the Quintom Models of Dark Energy and the Effects on Observations
• Probing Dynamics of Dark Energy with Supernova, Galaxy Clustering and the Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations
• Interacting cosmic fluids in power-law Friedmann-Robertson-Walker cosmological models
• Simplified Quartessence Cosmology
• Crossing the phantom divide with a classical Dirac field