According to a professor at Indiana University: "We're inside a black hole that exists in another universe. Specifically, a black hole that rebounded, somewhat like a spring." That's right, professor Nikodem Poplawski decided to use a modified version of Einstein's general relativity equation set that takes particle spin into account. Continue reading for a video and more information.
Poplawski also adds: "We may not be living in our universe at all; we might be living inside a rebounded black hole that exists in a different universe. We could tell by measuring the preferred direction of our universe. A spinning black hole would have imparted some spin to the space-time inside it, which would violate a law of symmetry that links space and time. This might explain why neutrinos oscillate between their antimatter and regular-matter states."