On 2/10/2012 12:51 PM, meekerdb wrote:
On 2/10/2012 5:26 AM, Stephen P. King wrote:
Now we can
quibble about this and discuss how in Special Relativistic situations we
can indeed have situations there "X caused Y" is true for some frames of
reference and "Y caused X" for some other frame of reference, but this
dilemma can be resolved by considering the effect of a finite speed of
light whose "speed" is an invariant for all observers, e.g. general
covariance.
This wrong. SR shows that it can be the case "X is before Y" in one
frame and "Y is before X" in a different frame moving relative to the
first frame. This means X and Y are spacelike separated. But you
can't have "X caused Y" in one frame and "Y caused X" in another. "X
caused Y" implies that Y is in the timelike or null future of X; a
relation that preserved in all Lorentz frames.
Brent
Hi Brent,
Yes, you are correct. I was thinking of the scenario that Penrose
discussed in The Emperor's New Mind about the fleet of ships in Andromeda.
Onward!
Stephen
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