Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-05-15
Int.J.Mod.Phys.D17:651-658,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
9 pages, selected for "Honorable Mention" by the Gravity Research Foundation
Scientific paper
10.1142/S0218271808012395
Different models of the cosmic substratum which pretend to describe the present stage of accelerated expansion of the Universe like the $\Lambda$CDM model or a Chaplygin gas, can be seen as special realizations of a holographic dark energy cosmology if the option of an interaction between pressurless dark matter and dark energy is taken seriously. The corresponding interaction strength parameter plays the role of a cosmological constant. Differences occur at the perturbative level. In particular, the pressure perturbations are intrinsically non-adiabatic.
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