Transient cosmic acceleration from interacting fluids

Details Transient cosmic acceleration from interacting fluids Transient cosmic acceleration from interacting fluids

2009-10-18

arxiv.org/abs/0910.3246v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Latex file, 23 pages, 21 figures in eps format. Discussion enlarged, new subsection on scalar field dynamics included, accepte

Scientific paper

Recent investigations seem to favor a cosmological dynamics according to which the accelerated expansion of the Universe may have already peaked and is now slowing down again \cite{sastaro}. As a consequence, the cosmic acceleration may be a transient phenomenon. We investigate a toy model that reproduces such a background behavior as the result of a time-dependent coupling in the dark sector which implies a cancelation of the "bare" cosmological constant. With the help of a statistical analysis of Supernova Type Ia (SNIa) data we demonstrate that for a certain parameter combination a transient accelerating phase emerges as a pure interaction effect.

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