The Dark Ages of the Universe and hydrogen reionization

The Dark Ages of the Universe and hydrogen reionization Aravind Natarajan1,∗ and Naoki Yoshida2,3 1Department of Physics and Astronomy, University of Pittsburgh, 100 Allen Hall, 3941 O’Hara Street, Pittsburgh, PA 15260, U.S.A. 2Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan 3Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan ∗E-mail: aravind@pitt.edu