h a l f b a k e r yVeni, vedi, fish velocipede
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Superconductivity in a vacuum needs a few minor things,
such as a simply enormous magnetic field, or a handy
particle accelerator.
But it is the lightest superconductor available, perhaps,
and lends itself to levitation against another magnetic
field.
So...a vacuum superconductor system
- ground based -
and - vehicle based- could be the basis of a flying type of
vehicle.
Vacuum superconductor
http://www.newscien...r.html#.UoQHKY1gBFQ
[spidermother, Nov 13 2013]
[link]
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What you say can only be true if the vacuum is
perfect, no atoms at all floating about in there. Even
one would introduce some interference/resistance
with the flow of electrons through the volume it
occupies. |
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More detail, please. Vernon it up some. How would this be done? |
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"Chernodub likens the resulting condensate to that formed by ordinary superconductors. Below a certain critical temperature, electrons in these materials bind together in so-called Cooper pairs, which all share the same quantum state and so flow without friction. However, Paul Olesen of the University of Copenhagen in Denmark says the similarity is not exact because ordinary superconductors repel magnetic fields." |
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No repulsion of magnetic fields means no levitation. |
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No Meissner effect is rather strange...I wonder if the
current density is unlimited... |
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If so, the potential magnetic forces could be huge as well.
But how can a vacuum exert a force? Hmmm...thinks... |
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Nothing in Chernodub's speculative work on
vacuum superconduction or other physicists'
comments on it suggest practical engineering
applications. It's mostly interesting in its
suggestion that superconductivity played some
role in the very early universe contributing to the
large scale structure - ie the arrangment of
galaxies - we see now. |
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His speculation concerns making virtual particles
real, like the demonstrated Casimir effect, which
uses mechanical confinement, or speculated
Hawking radiation, which uses gravity, using
magnetism. The particles involved - rho mesons -
are very short-lived - on the order of 10^-24
seconds - and would require huge machines to
create. Compared to one using ordinary
superconducting materials, such a system wouldn't
be "the lightest available", any more than a heavy
metal or glass vacuum chamber is lighter than a
helium party balloon of the same volume. |
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So that's what Dyson is really up to.... |
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