Computer Simulations of Cosmic Reionization

Details Computer Simulations of Cosmic Reionization Computer Simulations of Cosmic Reionization

2009-06-23

arxiv.org/abs/0906.4348v1

Adv.Sci.Lett.4:228-243,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Invited Review to appear on Advanced Science Letters (ASL), Special Issue on Computational Astrophysics, edited by Lucio Mayer

Scientific paper

10.1166/asl.2011.1214

The cosmic reionization of hydrogen was the last major phase transition in the evolution of the universe, which drastically changed the ionization and thermal conditions in the cosmic gas. To the best of our knowledge today, this process was driven by the ultra-violet radiation from young, star-forming galaxies and from first quasars. We review the current observational constraints on cosmic reionization, as well as the dominant physical effects that control the ionization of intergalactic gas. We then focus on numerical modeling of this process with computer simulations. Over the past decade, significant progress has been made in solving the radiative transfer of ionizing photons from many sources through the highly inhomogeneous distribution of cosmic gas in the expanding universe. With modern simulations, we have finally converged on a general picture for the reionization process, but many unsolved problems still remain in this young and exciting field of numerical cosmology.

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