60 efolds with no inflaton, no slow roll, no reheating---QEG's apt to be right QEG predicts the Einstein-Hilbert action of General Relativity. don't have to put it in by hand Starting with zero entropy it predicts the right amount of entropy after inflation. (essentially the measured CMB entropy) It gives 60 efolds of inflation without any exotic matter field---no inflaton needed---just by the natural running of the cosmological constant, also a prediction of the theory. Conventional inflation they put in an exotic inflaton, which causes exponential expansion, and then THEY HAVE TO CONCOCT A WAY TO TURN IT OFF, so they fantasize a special "slow roll"---a way for the inflaton to die down, put in by hand. QEG inflation naturally turns itself off as the universe expands. No device is needed to shut QEG's natural inflation down. In conventional inflation scenarios they have to put in some device to "reheat" after inflation. The exotic "inflaton" field has to somehow decay so as to produce a lot of energetic matter. Another device put in by hand. QEG does not require any artificial "reheating" arrangement. The running of Lambda predicted by the theory transfers the required energy to whatever matter is present. THIS IS AN OCCAM THING. ONE SIMPLE RG FLOW EQUATION DOES EVERYTHING. The Renormalization Group flow equation gets you Einstein Hilbert action, bare values for G and Lambda, and tells how G and Lambda change with scale---so how they run during the early universe. And provides a long classical period during which they are constant, fit to observed values. I think this paper changes the picture in cosmology. It lets you throw out a lot of junk put in by hand (Guth, Linde, Vilenkin etc) and one thing, which it looks like Nature is providing us, covers all the bases. Maybe you'd like to discuss the paper: http://arxiv.org/abs/0706.0174 Entropy signature of the running cosmological constant Alfio Bonanno, Martin Reuter 57 pages, 7 figures (Submitted on 1 Jun 2007 (v1), last revised 3 Jun 2007 (this version, v2)) "Renormalization group (RG) improved cosmologies based upon a RG trajectory of Quantum Einstein Gravity (QEG) with realistic parameter values are investigated using a system of cosmological evolution equations which allows for an unrestricted energy exchange between the vacuum and the matter sector. It is demonstrated that the scale dependence of the gravitational parameters, the cosmological constant in particular, leads to an entropy production in the matter system. The picture emerges that the Universe started out from a state of vanishing entropy, and that the radiation entropy observed today is essentially due to the coarse graining (RG flow) in the quantum gravity sector which is related to the expansion of the Universe. Furthermore, the RG improved field equations are shown to possess solutions with an epoch of power law inflation immediately after the initial singularity. The inflation is driven by the cosmological constant and ends automatically once the RG running has reduced the vacuum energy to the level of the matter energy density."