Date: Mon Jan 3 11:37:50 2000
Posted By: Samuel Silverstein, faculty, physics, Stockholm University
Area of science: Physics
Interesting question. Einstein-Rosen Bridges, or "wormholes", are a solution
of the Schwarzschild geometry, which deals with the curvature of spacetime
around a spherical mass. In this solution, the event horizons of a black
hole and a white hole create a connection between two universes. There is an
excellent resource on wormholes and related topics
As you will see on those pages, there are some major problems with using
- Wormholes may not actually exist. Although they are a solution of
Einstein's equations, they require the existence of a white hole, which is
essentially a black hole running backwards in time, spitting out matter
rather than sucking it in. We have never seen evidence for white holes,
which is in some ways a comforting thing, since it would violate the second
law of thermodynamics.
- If it were possible to create wormholes (normal stars can't make one)
they would be unstable and fly apart. It might be possible to keep one open
by lining the inside with some sort of exotic matter (with negative
mass, and positive surface pressure), but there is no evidence such
- If you did create a wormhole and make it stable, you could get into
one, but you could never get out either side unless you entered
the wormhole at a speed faster than light, a relativisitic impossibility.
You would be trapped inside the wormhole, able to see light coming in from
both universes, but never able to escape, or send out any information to
But I wouldn't worry about it all too much. Current evidence suggests that
the "big crunch" will never happen, and the universe will simply keep
expanding forever. Take a look at
Ned Wright's Cosmology FAQ for some of the best-presented cosmology
information I have seen on the net.
Of course, if this is true that presents us with the problem of how to keep
surviving into eternity after all of the stars burn out. But we won't have
to start dealing with that issue until many billions of years from now, so I
figure we will probably learn a thing or two by then... :-)
Hope this helps.
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