In a recent paper written by Theoretical Physicist Nikodem Poplawski from Indiana University, the Physicist suggests that the universe within which we reside may actually itself be contained within a wormhole which is part of a black hole that lies in another, bigger universe. Confused yet? Good. In his paper, Physics Letters B, Poplawski takes advantage of the Euclidean-based coordinate system, referred to as isotropic coordinates, to describe the gravitational field of a black hole. This also helped him model the radial geodesic motion of a massive particle into the black hole.
Poplawski explains that only experiment or observation can reveal the actual motion of a particle falling into the black hole. He also notes that since an observer can only see the outside of the black hole, the interior cannot be observed unless you are within the black hole. This condition would be satisfied if our universe was the interior of a black hole existing within a larger universe. Poplawski explains that since Einstein’s Theory of General Relativity does not choose a time of orientation, it is possible to traverse time in either direction. That is to say, if a black hole can form from the gravitational collapse of matter through an event horizon in the future, then the opposite is true for the past. Such a process would describe an exploding white hole; matter emerging from an event horizon in the past, like the expanding universe.
A white hole is connected to a black hole via an Einstein-Rosen bridge (wormhole) and is hypothetically the time reversal of a black hole. Poplawski’s paper also suggests that all astrophysical black holes may have Einstein-Rosen bridges, each with a new universe inside that formed simultaneously with the black hole. Poplawski states that our universe could have itself formed from inside a black hole existing in another universe.
Much more work is to be done before anything like this is proven, but for now it provides a new way to explain the origins of our universe. Unlike the big bang theory, this theory does not seem to contain any big contradictions. It would also help explain the information that we assumed was lost when something entered the event horizon of a black hole. This method would not violate the laws of quantum physics, which states that matter cannot be created or destroyed, but must always be preserved. This model, in isotropic coordinates, of the universe as a black hole could explain the origin of cosmic inflation.
Source: [Science Daily]