The first stars and their effects in the surrounding universe.
Andrea Ferrara (Osservatorio Astrofisico di Arcetri, Firenze et Laboratoire de Radioastronomie,ENS, Paris)

Jeudi 23 novembre 2000

Very likely the first light in the universe after the Big Bang was produced by stars. The nature, properties, formation mode and epoch of these objects are still largely unknown, but their study is one of the most active areas in current cosmology.

This is partly motivated also by the conspicuous number of experiments currently built to test these crucial early epochs of the evolution of the universe. I will discuss the relevant physical processes connected with the formation of the first collapsed structures and the processes affected by them as the reionization and heavy element enrichment of the intergalactic medium, history of galaxy formation, high redshift supernovae and interplay with the Cosmic Microwave Radiation.

I will conclude by presenting different observational strategies to best probe the universe in its infancy.