Reionization signatures in quasar absorption spectra

One of the most refined qualities of the human mind concerns with its natural attitude in questioning itself about the reason of everything it gets in touch with. This is a cascade process which inevitably ends up in wondering how the Universe originated and evolved into terrestrial life. In the course of ages the best approach to satisfy the human thirst of knowledge has proved to be the “scientific method”, based on the precious interplay between “tangible” (observations) and “intelligible” (theory). Cosmology is a discipline which aims, through this method, at shedding light on all the phases of the evolution of the Universe. Up to now the available technology has allowed to open and only partially come through the gates of the comprehension of the Universe...