Theory Group


Cosmic Reionization

Early Universe

First Stars & Galaxies

Fundamental Physics

Structure Formation

Extragalactic Astrophysics

Clusters of Galaxies

Theoretical & Computational Astrophysics

Galactic Evolution

ISM and Star Formation

Milky Way Evolution

Planetary Sciences


Planet Formation

Stellar Astrophysics


Gamma-ray Bursts

Neutron Stars & Magnetars


White Dwarfs

Theory Group : Cosmology : Cosmic Reionization


I- Introduction

The earliest generations of stars are thought to have transformed the universe from darkness to light and to have reionized and heated the intergalactic medium (Barkana & Loeb 2001). Knowing how the reionization process happened is a primary goal of cosmologists, because this would tell us when the early stars formed and in what kinds of galaxies. The clustering of these galaxies is particularly interesting since it is driven by large-scale density fluctuations in the dark matter (Barkana & Loeb 2004). While the distribution of neutral hydrogen during reionization can in principle be measured from maps of 21-cm emission by neutral hydrogen, upcoming experiments are expected to be able to detect ionization fluctuations only statistically (for reviews see, e.g., Furlanetto et al. 2006; Barkana & Loeb 2007)...


Measuring the History of Cosmic Reionization using the 21-cm PDF from Simulations astro-ph

Paul Shapiro

ADS | astro-ph

Paul Shapiro  



Research Interests

Theoretical astrophysics: cosmology, galaxy formation, the interstellar medium, the intergalactic medium, interstellar dust grains, astrophysical hydrodynamics.

Group Areas

Theory, Cosmic Reionization, Early Universe, First Stars & Galaxies, Structure Formation, Clusters of Galaxies, ISM and Star Formation, Milky Way Evolution

(top) Slice of the Cosmic Web of Dark Matter at redshift z = 6 from our CubeP3M Code simulation with 30723 particles (29 billion) on a 61443 fine grid in a comoving volume of 163 Mpc on a side. (bottom) zoom-in of 10 Mpc × 10 Mpc subregion. Slices are 20 Mpc thick.


Simulating Cosmic Reionization astro-ph