Fundamental scale invariance

We propose fundamental scale invariance as a new theoretical principle beyond renormalizability. Quantum field theories with admit scale-free formulation of the functional integral and effective action in terms invariant fields. They correspond to exact scaling solutions renormalization flow equations. Such are highly predictive since all relevant parameters for deviations from solution vanish. Realistic particle physics quantum gravity compatible this setting. The non-linear restrictions can explain properties an asymptotically vanishing cosmological constant or dynamical dark energy that would seem need fine tuning perturbative viewpoint. As example we discuss pregeometry based on diffeomorphism Yang-Mills theory. It is candidate ultraviolet completion well behaved graviton propagator at short distances.