The Earliest Epoch of Reionisation in the Standard $Λ$CDM Model

Details The Earliest Epoch of Reionisation in the Standard $Λ$CDM Model The Earliest Epoch of Reionisation in the Standard $Λ$CDM Model

2003-03-06

arxiv.org/abs/astro-ph/0303129v3

Mon.Not.Roy.Astron.Soc. 343 (2003) L25

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, revised version published in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06854.x

We show that the earliest possible reionisation of the Universe is approximately at $z\simeq 13.5$ and the optical depth is $\tau\simeq 0.17$ in the conventionally accepted $\Lambda$ cold dark matter ($\Lambda$CDM) model with adiabatic fluctuations of a flat spectrum normalised to the cosmic microwave background. This is consistent with the reionisation found by WMAP (the apparently earlier reionisation epoch of the WMAP is ascribed to the adoption of the instantaneous reionisation approximation), i.e., the WMAP result is realised only if reionisation of the universe takes place nearly at the maximal efficiency in the $\Lambda$CDM model.

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