Lorentzian wormholes known as
**Schwarzschild wormholes** or
**Einstein-Rosen bridges** are bridges between areas
of space that can be modeled as vacuum solutions to the Einstein
field equations by combining models of a black hole and a white
hole. This solution was discovered by Albert Einstein and his
colleague Nathan Rosen, who first published the result in 1935.
However, in 1962 John A. Wheeler and Robert W. Fuller published a
paper showing that this type of wormhole is unstable, and that it
will pinch off instantly as soon as it forms, preventing even
light from making it through.

The Einstein-Rosen Bridge. A safe
bet that a great numbers of you are not familiar with this
"theory."

"The relativistic description of black holes requires wormholes
at their centers. These wormholes, called Einstein-Rosen bridges
after Einstein and his collaborator Nathan Rosen, seem to connect
the center of a black hole with a mirror universe on the "other
side" of space time. At first, the bridge was considered a
mathematical oddity, but nothing more. It was essential for the
internal consistency of the Schwarzschild solution to Einstein's
equations, which was the first relativistic solution involving
black holes. However, the wormhole could not be traversed because
the center of a black hole is a singularity, a point of infinite
space time curvature, where the gravity would also be infinite
and all matter would be crushed to its most fundamental
constituents. Additionally, travel through the wormhole would
require motion faster than the speed of light, a physical
impossibility. For these reasons, Einstein-Rosen bridges were
quickly forgotten despite other later solutions that included
them. They were assumed to be mathematical oddities that had no
bearing on physical reality.

In 1963, Roy Kerr devised the famous Kerr solution to Einstein's equations, a more realistic description of black holes than the original Schwarzschild solution. Kerr assumed the star that would form the black hole to be rotating and found that it would not eventually collapse to a point, but rather to a ring. When approaching the ride from the side, gravity and space time curvature are both still infinite, so matter is again inevitably destroyed. However, traveling through the ring would result in large but finite gravity. An object that does so and avoids being crushed by the still-formidable gravity can enter the Einstein-Rosen bridge and gain access to the mirror universe."

| Email this Article
| Add to reading list