Our Universe at Home Within a Larger Universe? So Suggests Physicist's Wormhole Research

ScienceDaily (Apr. 7, 2010) —
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 (also
called an Einstein-Rosen Bridge) is suggested in a paper from Indiana University
theoretical physicist Nikodem Poplawski in Physics Letters B. The final version
of the paper was available online March 29 and will be published in the journal
edition April 12.

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 into a black hole.

In studying the radial motion through the event horizon (a black hole's
boundary) of two different types of black holes -- Schwarzschild and
Einstein-Rosen, both of which are mathematically legitimate solutions of general
relativity -- Poplawski admits that only experiment or observation can reveal
the motion of a particle falling into an actual black hole. But he also notes
that since observers can only see the outside of the black hole, the interior
cannot be observed unless an observer enters or resides within.

"This condition would be satisfied if our universe were the interior of a black
hole existing in a bigger universe," he said. "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, not just Schwarzschild and
Einstein-Rosen 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," he said.

By continuing to study the gravitational collapse of a sphere of dust in
isotropic coordinates, and by applying the current research to other types of
black holes, views where the universe is born from the interior of an
Einstein-Rosen black hole could avoid problems seen by scientists with the Big
Bang theory and the black hole information loss problem which claims all
information about matter is lost as it goes over the event horizon (in turn
defying the laws of quantum physics).

This model in isotropic coordinates of the universe as a black hole could
explain the origin of cosmic inflation, Poplawski theorizes.

Poplawski is a research associate in the IU Department of Physics. He holds an
M.S. and a Ph.D. in physics from Indiana University and a M.S. in astronomy from
the University of Warsaw, Poland