A small change to the theory of gravity implies that our universe inherited its arrow of time from the black hole in which it was born. Accordingly, our own Universe may be the interior of a black hole existing in another universe." So concludes Nikodem Poplawski at Indiana University in a remarkable paper about the nature of space and the origin of time.According to the story, Poplawski has such a derivation. It gets stranger:
The idea that new universes can be created inside black holes and that our own may have originated in this way has been the raw fodder of science fiction for many years. But a proper scientific derivation of the notion has never emerged.
Incidentally, this approach also suggests a solution to another of the great problems of cosmology: why time seems to flow in one direction but not in the other, even though the laws of physics are time symmetric.From a theological perspective, it doesn't explain away the existence of God, it just pushes him beyond the bounds of this universe. Still, this idea is out there.
Poplawski says the origin of the arrow of time comes from the asymmetry of the flow of matter into the black hole from the mother universe. "The arrow of cosmic time of a universe inside a black hole would then be fixed by the time-asymmetric collapse of matter through the event horizon," he says.
In other words, our universe inherited its arrow of time from its mother.