Dark Energy: A Unifying View
Abstract
Different models of the cosmic substratum which pretend to describe the present stage of accelerated expansion of the Universe like the 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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