Simulating metal and HI absorption lines at the conclusion of Reionization

The study of chemical elements and their absorption lines in the spectra of very distant quasars provides information on the state of the gas residing in the intergalactic medium and the different processes that occur during the early Universe. This thesis investigates the properties of gas in the distant Universe in regions ionized by a uniform ultraviolet radiation field that accounts for photons produced by galaxies and quasars. We use a set of high resolution cosmological computer simulations to generate metal and hydrogen gas absorption line features as a result of the chemical enrichment from stars and supernovae.