Dennis Ochei wrote:
Oh i see the issue. I didn't realize you'd assume the scanner is
immobile. Immobilizing it relative to everything in the universe is
uhhh... rather difficult.
The scanning event is taken as a single point in space-time. Mobility is
irrelevant. If you create duplicates, they can be sent to space-like
separated points, as Brent says. But if you simply reconstruct at some
later time at the same location, then the events are separated by a
time-like interval. This makes a difference to whether or not the time
order is unique -- it is for time-like separations.
Bruce
On Monday, April 20, 2015, Bruce Kellett <bhkell...@optusnet.com.au
<mailto:bhkell...@optusnet.com.au>> wrote:
Dennis Ochei wrote:
http://en.m.wikipedia.org/wiki/Relativity_of_simultaneity
I thought this was basic relativity 101? The video gives a
concrete example with a train moving at relativistic speeds
through a tunnel. The train lorentz contracts such that it is
shorter than the tunnel. To an observer outside the tunnel, off
the train, there will come a point in time when the train is
completely within the tunnel. At this point two guillotines slam
downwards simultaneously at the exit and the entrance of the
tunnel and rise again barely missing the train.
From a frame on the train, the tunnel is lorentz contracted to
be shorter than the train. The nose of the train is just barely
missed by the guillotine at the exit while the back of the train
portrudes from the tunnel. Some moments later the back of the
train enters the tunnel and the guillotine at the entrance
slams down behind it with the front portruding.
The two ends of the train are separated by a space-like interval,
not a time-like interval.
Bruce
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