Re: Earlier or later
From: John T Lowry (jlowry100_at_earthlink.net)
Date: 09/29/04
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Date: Wed, 29 Sep 2004 17:18:42 +0000 (UTC)
"Jagmeet Singh" <jagmeetus@yahoo.com> wrote in message
news:20040929113552.9982.qmail@web21005.mail.yahoo.com...
> Two identical events occur very close by in time(at
> roughly the same location)--consider e.g. emission of
> 2 identical photons by an assembly of atoms.The time
> difference between the emissions is exceedingly
> small(say ten to the power minus twenty seconds).
> The question is:-can we say with certainty which
> photon is emitted earlier and which later?If not what
> does this imply?
> Jagmeet
>
> P.S. New thread
In non-relativistic (NR) theory of Thomson scattering, only the
1st-order AA "seagull" Feynman graph (simultaneous absorption and
emission) is taken into account. In the (more accurate) relativistic
theory, on the other hand, that seagull graph is replaced by two graphs,
in each of which photons are absorbed and emitted one at a time. One of
the graphs has absorption first (in time), the other has emission first.
John Lowry
Flight Physics
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