  The novel idea is that the undergoing accelerated expansion of the universe
happens due to infrared quantum gravity modifications at intermediate
astrophysical scales of galaxies or galaxy clusters, within the framework of
Asymptotically Safe gravity. The reason is that structures of matter are
associated with a scale-dependent positive cosmological constant of quantum
origin. In this context, no extra unproven energy scales or fine-tuning are
used. Furthermore, this model was confronted with the most recent observational
data from a variety of probes, and with the aid of Bayesian analysis, the most
probable values of the free parameters were extracted. Finally, the model
proved to be statistically equivalent with $\Lambda$CDM, and thus being able to
resolve naturally the concept of dark energy and its associated cosmic
coincidence problem.
