Transient cosmic acceleration from interacting fluids
Abstract
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.
Keywords
Cite
@article{arxiv.0910.3246,
title = {Transient cosmic acceleration from interacting fluids},
author = {Julio C. Fabris and Bernardo Fraga and Nelson Pinto-Neto and Winfried Zimdahl},
journal= {arXiv preprint arXiv:0910.3246},
year = {2015}
}
Comments
Latex file, 23 pages, 21 figures in eps format. Discussion enlarged, new subsection on scalar field dynamics included, accepted for publication in JCAP.