Re: Quantum Computers

John Clark (
Sun, 22 Aug 1999 00:27:30 -0400

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Gabriele Betti <> Wrote:

>I'd like to know more of what could be related to time travel

Tipler found a solution in General Relativity that shows that an infinitely long, extremely dense cylinder made of Neutronium (the stuff of Neutron Stars) and spinning at almost the speed of light would be able to tip a light cone enough to act as a time machine and allow you to visit the past, but there are two very important problems.

  1. Nobody knows if a cylinder of finite length would work also, the math is too difficult to figure out.
  2. The very rapid rotation would cause the cylinder to fly apart. This is much more than just an Engineering difficulty, no known force in Physics would be strong enough to hold the cylinder together, not even the strong nuclear force. For this to work new Physics would need to be found, which is just another way of saying that as far as we know now it's impossible.

John K Clark

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