Our universe at home within a larger universe?Could our universe be located within the interior of a wormhole which itself is part of a black hole that lies within a much larger universe? Such a scenario in which the universe is born from inside a wormhole is suggested by theoretical physicist Nikodem Poplawski from Indiana University.
Poplawski takes advantage of the Euclidean-based coordinate system called isotropic coordinates to describe the gravitational field of a black hole and to model the radial geodesic motion of a massive particle through the event horizon of Schwarzschild and Einstein-Rosen black holes.
Because Einstein’s general theory of relativity does not choose a time orientation, if a black hole can form from the gravitational collapse of matter through an event horizon in the future then the reverse process is also possible. 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 by an Einstein-Rosen bridge (wormhole) and is hypothetically the time reversal of a black hole. Poplawski’s paper suggests that all astrophysical black holes, may have Einstein-Rosen bridges, each with a new universe inside that formed simultaneously with the black hole.
From that it follows that our universe could have itself formed from inside a black hole existing inside another universe.
Image: Einstein-Rosen bridges have never been observed in nature, but they provide theoretical physicists and cosmologists with solutions in general relativity by combining models of black holes and white holes.
Source: Indiana University
