1.Yerevan Physics Institute and Yerevan State University, Yerevan, 0036, Armenia
2. Mathematical Institute,24-29 St Giles’, Oxford OX1 3LB, U.K.
Abstract Conformal cyclic cosmology (CCC) posits the existence of an aeon preceding our Big Bang B, whose conformal infinity I is identified, conformally, with B, now regarded as a spacelike 3-surface. Black-hole encounters, within bound galactic clusters in that previous aeon, would have the observable effect, in our CMB sky, of families of concentric circles overwhichthetemperaturevarianceisanomalouslylow,thecentreofeachsuchfamilyrepresentingthepointofI atwhich the cluster converges. These centres appear as fairly randomly distributed fixed points in our CMB sky. The analysis of Wilkinson Microwave Background Probe’s (WMAP) cosmic microwave background 7-year maps does indeed reveal such concentric circles, of up to 6σ significance. This is confirmed when the same analysis is applied to BOOMERanG98 data, eliminating the possibility of an instrumental cause for the effects. These observational predictions of CCC would not be easily explained within standard inflationary cosmology.