The cosmic web contains most of the mass of the Universe. It is revealed through hydrogen and helium absorption lines in the spectra of distant Quasi-Stellar Sources (QSOs), which act as background lightbulbs against which the absorption is measured. The purpose of the workshop is to bring together world-leading experts in the study of the IGM. The topics to be covered include the hydrogen and helium distributions in the IGM, cosmological constraints from the Lyman-alpha forest, the metal content of the IGM and the interaction between galaxies and their circumgalactic gas.
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