Synopsis The exploration of the first billion years of the history of the Universe, from the so-called dark ages to cosmic reionisation, represents one of the great challenges of contemporary astrophysics. During these phases the first structures start to grow forming the first stars, galaxies, and possibly also soon the first quasars. At the same time the dark, neutral Universe starts to be lit up and ionised by these sources, leading to its progressive reionisation anding at a redshift of about 6. Furthermore the first stars and supernovae begin to enrich their surroundings and the intergalactic medium, and to produce the first dust. In the recent years tremendous progress has been made on the theoretical understanding and on numerical simulations of the underlying astrophysical mechanisms. Furthermore, observations of signatures of reionisation and even direct observations of galaxies at redshifts larger than 6 are now becoming feasible.The observational and theoretical aspects of this story were comprehensively and pedagocically covered by the lecturers of the 36th Saas-Fee Advanced Course. This volume contains their worked out and updated lecture notes. From the Back Cover The exploration of the first billion years of the history of the Universe, from the so-called Dark Ages to cosmic reionisation, represents one of the great challenges of contemporary astrophysics and one of the main drivers for future observational facilities. The book contains the elaborated notes of lectures given at the 36th Saas-Fee Advanced Course "First Light in the Universe" by three eminent scientists in the field: Abraham Loeb, Andrea Ferrara, and Richard Ellis. The formation of the first stars and black holes, the initial mass function, feedback effects, early dust formation, the history of cosmic star formation, distant galaxies, cosmic reionisation and the cosmic infrared background are the main topics treated. This book provides an accessible and up-to-date review of the field and will be useful to graduate students of astronomy, cosmologists, physicists and researchers.
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