I just want to say that the first person
with this idea was Roger Penrose - sort of. OK, he ascribed the circular patterns in the CMBR to "leaks" from the last big crunch, but it seems that this theory lines up with his original idea.
In Nov. 2010, British physicist Roger Penrose went on the record to say that it was by his reckoning that there were patterns in the cosmic microwave background radiation (CMBR) -- the "echo" of the Big Bang. Penrose's theory is that gravitational waves -- "ripples" in spacetime -- leaked through from the pre-Big Crunch universe, imprinting the CMBR with detectable rings.
Although Penrose's idea was heavily criticized (cosmologists familiar with the CMBR said that Penrose was seeing shapes and patterns in the random temperature "anisotropies" and not seeing what he thought he was seeing), could Carr and Coley's pre-Big Bang black holes be detected?