Our Universe at Home Within a Larger Universe?

[geomancer]

Our universe at home within a larger universe? So suggests physicist's wormhole research

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.


Adapted from materials provided by Indiana University.
Journal Reference:

Nikodem J. Popławski. Radial motion into an Einstein-Rosen bridge. Physics Letters B, 2010; 687 (2-3): 110 DOI: 10.1016/j.physletb.2010.03.029

[Tars]

massive particle

What's a "massive particle"? Perhaps it's a large mass consisting mainly of ethereal gobbledygook.

A white hole

What's a "white hole"? The article seems to suggest that it is comprised of energy being ejected from the black hole. But then it isn't a "hole" or gravity well as is a black hole. Perhaps it would be more appropriate to call that energy a "white pole"?

our universe could have itself formed from inside a black hole existing inside another universe,"

What about this theory indicates that our universe is "inside" some other universe, instead of adjacent to another universe, as is proposed in String Theory? Universes "inside" of other universes have the same problem as a single universe. They all require a "singularity", or unknown unexplainable event in order to exist. Universes existing next to each other, perhaps in separate dimensions, seems more easily grokable.

I suspect that people alive today will never know.