Interacting dark energy and transient accelerated expansion

Abstract

We argue that interactions in the dark sector may have a crucial impact on the cosmological dynamics. In particular, the future cosmic evolution may be very different from that predicted by the LCDM model. An example is a scenario in which the currently observed accelerated expansion is an interaction-induced transient phenomenon. We discuss such type of behavior on the basis of a two-fluid toy model.

3 pages, 1 figure, submitted to the Proceedings of the Marcel Grossmann Meeting MG 13, Stockholm, 1-7 July 2012