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QFT and Normall Ordering



 
 
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Old September 3rd 04 posted to sci.physics.relativity
Bilge
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Default QFT and Normall Ordering

Bill Hobba:

Got a couple of papers on the issues and need to work through them to see
what is happening. What some say is that provided super-symmetry is in
effect no problem. But when you apply a cutoff below that region then the
problems arise. What I do not understand is why it is ok to apply a cutoff
and get an answer that is not in agreement with experiment and say there is
a problem - raise the cutoff and no problems arise.


That isn't ok. The final result is supposed to be independent of
the cutoff. On the other hand, it might not really make any difference.
While one might be able to make some rather broad, general statements
about the physics one might expect to appear on the horizon, it's
probably a bit premature to worry if some theory about non-existent
physics is in deep trouble because of a mathematical nitpick. The
real trouble is that there aren't any phenomena searching for a theory
at the moment [see below, also].


Perhaps it is simply an
artifact of the arbitrary cutoff and we have not taken into account the
physics of regions we have no direct knowledge of. BTW from what I have
read so far I am with Weinberg - I am not convinced there is a problem but
will reserve my opinion until I have investigated it further. The issue
still seems rather puzzling. Will see if I can get a paper by Weinberg on
it.


I think if you read between the lines, you'll get the following message:

``Help... Desparate for some new physics to explain...''


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