Active Galaxies as probes of the Universe

Active Galaxies play an important role in shaping the evolution of the Universe, as seen in the observationally established black hole - galaxy relations. Coevolution of the nucleus of a galaxy and a host happens through the jets/wind from the vicinity of a central black hole affecting the star forming rate. But with the progressing knowledge of the active galactic nuclei (AGN) allows also to use them as probes of the Universe by measuring its expansion rate as a function of redshift. This is important since there are currently some tensions in the measurements of some cosmological parameters under the assumption of the standard LambdaCDM model. I will summarize these issues and I will present our current and future attempts to address this problem using AGN.