Are There Echoes From The Pre-Big Bang Universe? A Search for Low Variance Circles in the CMB Sky

Details Are There Echoes From The Pre-Big Bang Universe? A Search for Low Variance Circles in the CMB Sky Are There Echoes From The Pre-Big Bang Universe? A Search for Low Variance Circles in the CMB Sky

2010-12-08

arxiv.org/abs/1012.1656v1

The Astrophysical Journal, Volume 740, Issue 2, article id. 52 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Scientific paper

10.1088/0004-637X/740/2/52

The existence of concentric low variance circles in the CMB sky, generated by black-hole encounters in an aeon preceding our big bang, is a prediction of the Conformal Cyclic Cosmology. Detection of three families of such circles in WMAP data was recently reported by Gurzadyan & Penrose (2010). We reassess the statistical significance of those circles by comparing with Monte Carlo simulations of the CMB sky with realistic modeling of the anisotropic noise in WMAP data. We find that the circles are not anomalous and that all three groups are consistent at 3sigma level with a Gaussian CMB sky as predicted by inflationary cosmology model.

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