On 12 Sep 2015, at 19:21, John Clark wrote:
On Sat, Sep 12, 2015 spudboy100 via Everything List <[email protected]
> wrote:
> Clifford Pickover (mathematical biologist) once did an
interview with Godel, and a few weeks later, had a dream in which he
and Godel were playing chess, and in the dream Godel swept his arm
across the chessboard knocking all the pieces over. Pickover said he
woke up an noted the time. Later that morning he said he was
informed of Godel's passing, which happened to be the same time as
his dream. Godel also believed in an afterlife (crazy?) but only if
the universe rotated. It does not appear to rotate.
Godel discovered in 1949 that if the universe rotated then
according to Einstein's General Theory of relativity closed
timelike curves would exist, in other words time machines would
exist and it would be arbitrary to give one event the "cause" label
and another event the "effect" label, you could switch the labels
if you wanted; but if the universe does not rotate, and apparently
it doesn't, then Godel's discovery is of little importance.
Gödel was a logician. he constructed a model of the theory GR, just to
show a counter-example to some proposition by Einstein.
That pure GR leads to close time circle is of some conceptual
importance, especially that you don't need to rotate the universe, it
is enough to rotate a massive cylinder in the universe, and I am not
sure that some black hole collision are unable to create mini close
time loops.
We never knows the truth, but it is always interesting to have a good
idea of what our theories make necessary and what they make possible.
Bruno
John K Clark
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