This new theory is born from the idea that we live in a post-Big Bang universe that was born from another universe that underwent a "Big Crunch." After collapsing through gravitational contraction, all matter in this "pre-Big Bang universe" contracted to a point, bouncing, thus spawning the Big Bang.
But here's the rub, if everything from the previous universe collapsed to a point and then exploded as the Big Bang, wouldn't all information be destroyed? Surely all matter would have been blended together as pure energy and spat back out, producing a universe that bears no resemblance to its progenitor?
Perhaps not, say Carr and Coley; perhaps black holes spawned by the impossibly compact conditions of that dying universe survived the Big Bang and are dispersed throughout the current universe. What's more, the pair of researchers have put size limits on the mass of black holes that might survive the Big Crunch/Big Bang party.
As highlighted by the arXiv blog, pre-Big Bang black holes with masses of a few hundred million kilograms to the mass of the sun might have made it through. Black holes of these masses may have been able to retain their structure, keeping them separate from the Big Crunch singularity that is predicted to form. Then, as the Big Bang exploded to life, these black holes slipped into the new universe... our universe.