what is a worm hole?
worm hole, is actually "short-cut" in space and time.It is the same a shortcut between the two time points in the universe, or the link between the two different universes.In three-dimensional space, the shape of the worm hole should be like a tube.Of course, in the different dimensions of time and space, the appearance of the worm hole will also be different.
because it is based on not against law of physics now.Such as law of causation, conservation of energy.The golden rule of physics, you can't break it.On the premise of meet these rules, the so-called wormholes exist?Has proved, can be constructed.
the wormhole is divided into two kinds.Is a kind of "two-way through" worm hole, after the past is not come back, can only be one-way.Is at a very early age, the so-called "einstein-rosen bridge", is the connection between black holes and white holes worm hole, it is not to be two-way through.
in the 1980 s, hawking they do the wormhole is called "Euclidean wormholes".It didn't have time this concept, the only space deeply touched.Because of the discussion is Euclidean quantum gravity, the space-time topology will be the result.Through such a wormhole is two-way.
now wormhole academic requirements, "two-way available" people still want to come back.The two-way can through the wormhole, called "lorentzian wormholes.Academia generally think of now, the wormhole this concept, can through the wormhole is two-way, it connects with the same two distant points in the universe, or two different universe.
what is a black hole?
is the center of a black hole density is infinite, infinite space-time curvature, small volume, high quantity of heat is infinite part of singularity and the surrounding area, empty days this day area scope are not visible.According to Albert Einstein's theory of relativity, when a dying star collapses, it will gather into a bit, there will be a black hole, devour adjacent area of all light and any material universe.
if it is not a rotating black hole, then into the black hole's event horizon, he should to the singularity went down, the final will be torn by tidal forces.But there is a kind of situation, if the black hole is spinning, it will have a internal horizon, love is a Kerr ring internal horizon and through the Kerr ring, you can go to another universe.Note that the ring itself is not a singularity.The singularity is attached to the ring.
the difference between the two
black hole and worm hole in a similar way to the space around distorted, but no matter how similar, they are still there are some differences.
a black hole is is the sun at least 10 to 15 times the mass of the end of the evolution of stars.When a star after the supernova explosion, it may leave a burn the stellar debris.Since there is no external force against gravity, the debris will gradually collapse.In other words, the quality of it all will be squeezed to the point, at this point, time and space are stopped.The center of the black hole is called a singularity.In the singularity within a certain distance, gravity is very powerful, that nothing can escape, including light.
and worm hole are time and space on the smooth knitting a swelled.It may be like a tunnel of time and space.(which provided material for a lot of science fiction...) according to Einstein's theory of relativity, for an object is high speed accelerate, time passes more slowly.If one end of the wormhole are accelerated to nearly the speed of light, and the other end is static, then from one end to accelerate through the wormhole to static travelers will return to the past.