🚀 go-pugleaf

In article <1992Jul21.032510.6139@leland.Stanford.EDU>  
zamenhof@leland.Stanford.EDU (Daniel Fish) writes:


> Now, observer A will see one flash happen before the other.  Is there  
not
> some sense in which the second flash is already determined at that time,
> for that observer?  If so, is this a philosophical problem for QM,  
having
> a truly random event, such as a nuclear decay, somehow predetermined?

Here is an explaination:

Both events of flashing are'n simultanious in observer A's system. And  
there is NO chance of being predetermined, because in this case the later  
flashlight had to get the information 'the earlier one has flashed' from  
observer B outside BEFORE it flashes, which is impossible if the signal  
from B moves at c. Therefore the Information of the observer B can not be  
used, there is no predetermination.


But another well-known paradoxa is this:

Imagine a particle with a determine spin which 'explodes' in two particles  
with undetermined spins and equal masses. The seperate from each other in  
a large distance and their spin is undetermined. When they are far away  
their spins are measured simultaniously By observers A and B (in the  
center-of-mass-system, syncronized for example by a flash at the time of  
explosion). Each observer A and B could measure various spins, which are  
determined at the time of measurement. On the other hand these spins have  
to be correlated because of the initial spin of the exploding particle. So  
the particle at A has to know SIMULTANIOUSLY which spin is measured by B,  
the signal has to move with infinity speed, contradictive to the SR.

This is a summary of the EINSTEIN-PODGOLSKY-ROSEN-experiment (I hope I got  
the names right).

So long

Harry