ON EVOLUTION OF THE INTERACTING COSMOLOGICAL CONSTANT

An alternative scenario of a three-phase cosmological evolution is proposed. In the earliest phase I and the latest phase III, we have a universe with a non-interacting cosmological constant λ along with the radiation or matter, each evolving separately. However, in the intermediate phase II (so-called Q phase), it interacts with the background matter and the scale dependence of energy densities is influenced by the interaction. A possible diagnostic for it is also prescribed.