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Conformal cyclic cosmology (CCC) posits the existence of an aeon precedingour Big Bang 'B', whose conformal infinity 'I' is identified, conformally, with'B', now regarded as a spacelike 3-surface. Black-hole encounters, within boundgalactic clusters in that previous aeon, would have the observable effect, inour CMB sky, of families of concentric circles over which the temperaturevariance is anomalously low, the centre of each such family representing thepoint of 'I' at which the cluster converges. These centres appear as fairlyrandomly distributed fixed points in our CMB sky. The analysis of WilkinsonMicrowave Background Probe's (WMAP) cosmic microwave background 7-year mapsdoes indeed reveal such concentric circles, of up to 6{\sigma} significance.This is confirmed when the same analysis is applied to BOOMERanG98 data,eliminating the possibility of an instrumental cause for the effects. Theseobservational predictions of CCC would not be easily explained within standardinflationary cosmology.

Concentric circles in WMAP data may provide evidence of violent pre-Big-Bang activity