Abstract
The renormalization group (RG) improved cosmologies based upon a RG trajectory ofquantum Einstein gravity (QEG) with realistic parameter values are investigated using asystem of cosmological evolution equations which allows for an unrestricted energyexchange between the vacuum and the matter sector. It is demonstrated that the scaledependence of the gravitational parameters, the cosmological constant in particular, leadsto an entropy production in the matter system. The picture emerges that theUniverse started out from a state of vanishing entropy, and that the radiationentropy observed today is essentially due to the coarse graining (RG flow) inthe quantum gravity sector which is related to the expansion of the Universe.Furthermore, the RG improved field equations are shown to possess solutions withan epoch of power law inflation immediately after the initial singularity. Theinflation is driven by the cosmological constant and ends automatically once theRG running has reduced the vacuum energy to the level of the matter energydensity.
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