Abstract
We consider the history of the universe from a possible big bang or a bounce into a late period of a unified interacting dark energy-dark matter model. The model is based on the Two Measures Theories (TMT) which introduces a metric independent volume element and this allows us to construct a unification of dark energy and dark matter. A generalization of the Two Measures Theories gives a diffusive nonconservative stress-energy-momentum tensor in addition to the conserved stress-energy tensor which appear in Einstein equations. These leads to a formulation of interacting DE-DM dust models in the form of a diffusive-type interacting Unified Dark Energy and Dark Matter scenario. The deviation from ?CDM is determined by the diffusion constant C2. For C2 = 0 the model is indistinguishable from ?CDM. Numerical solutions of the theories show that in some C2?0 the evolution of the early universe is governed by Stiff equation of state or the universe bounces to hyper-inflation. But all of those solutions have a final transition to ?CDM as a stable fixed point for the late universe.
Original language | English |
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Article number | 1850119 |
Journal | International Journal of Modern Physics A |
Volume | 33 |
Issue number | 20 |
DOIs | |
State | Published - 20 Jul 2018 |
Keywords
- dark energy
- dark matter
- Diffusion
- dynamical time
- two measure theories
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Astronomy and Astrophysics