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- Newsgroups: sci.physics
- Path: sparky!uunet!email!news
- From: gast@next.ben-fh.tuwien.ac.at (Gast)
- Subject: Re: Relativity and Quantum Mechanics
- Message-ID: <1992Jul22.130507.21744@email.tuwien.ac.at>
- Sender: news@email.tuwien.ac.at
- Nntp-Posting-Host: next.ben-fh.tuwien.ac.at
- Organization: Technical University of Vienna
- References: <1992Jul21.032510.6139@leland.Stanford.EDU>
- Distribution: usa
- Date: Wed, 22 Jul 1992 13:05:07 GMT
- Lines: 40
-
- 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
-