|Could you explain a black hole's singularity?
What would be the circumstances in which a person
could create one artificially, probably using
artificial gravity - so we dont have a super
large gravitational well?
|Question Date: 2007-09-02|
If you have enough gravity, everything gets
sucked in--even light itself. At the boundary of
a black hole, time stops completely, and most of
what we know of physics breaks down at that point.
To generate a black hole, you need to compress
some amount of mass into a *very* small volume.
There's a good article on the possible creation of
artificial black holes here:
the article points out, these black holes are so
small that they almost immediately vanish
harmlessly. Or as another article says it, "It's
quite hard to destroy the Earth."
When volume shrinks to zero and mass stays
constant - that is a basic black hole. Once a mass
shrinks below the radius where light can
escape,called the Schwartzchild radius, we can't
see it any more, and it effectively goes into
another dimension. You can't create a black hole
in a laboratory, even though people talk about it.
The conditions are too extreme!
everybody: go out and buy yourselves a copy of
Lawrence Krauss's book, The Physics of Star Trek.
He explains all this very nicely!Cheers,
A singularity is a mathematical concept at
which the curvature of the universe and thus the
force of gravity and the density become infinite.
There is no theoretical minimum size for a black
hole, although small ones (even large ones, given
enough time) will evaporate due to the laws of
quantum mechanics. There is no known way to
"create" gravity; gravity can be simulated by
centripetal acceleration, but this is not the same
as gravity and there is no way to construct this
to create a singularity, because of the symmetry
of the situation does not have a central point
where forces become infinite (instead, they become
zero at the central point!). If you could
manufacture a gravitational singularity somehow,
there is no reason why you could not make its mass
anything you wanted,which means that it would not
have to be large. It's only infinite at the
singularity itself! A black hole with the mass of
a human being would, as a general rule, create the
gravitational field of... a human being.
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