99 citations · 239 across the 5 of their papers we have counts for
4 papers
The Infancy of Cosmic Reionization
Rennan Barkana
We consider the early stages of cosmic hydrogen or helium reionization, when ionizing sources were still rare. We show that Poisson fluctuations in the galaxy distribution substant…
Large Einstein Radii: A Problem for LambdaCDM
Tom Broadhurst, Rennan Barkana
The Einstein radius of a cluster provides a relatively model-independent measure of the mass density of a cluster within a projected radius of ~ 150 kpc, large enough to be relativ…
On Correlated Random Walks and 21-cm Fluctuations During Cosmic Reionization
Rennan Barkana
Analytical approaches to galaxy formation and reionization are based on the mathematical problem of random walks with barriers. The statistics of a single random walk can be used t…
The Physics and Early History of the Intergalactic Medium
Rennan Barkana, Abraham Loeb
The intergalactic medium - the cosmic gas that fills the great spaces between the galaxies - is affected by processes ranging from quantum fluctuations in the very early universe t…