QFT and Normall Ordering
From: Bill Hobba (bhobba_at_rubbish.net.au)
Date: 08/31/04
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Date: Tue, 31 Aug 2004 02:19:51 GMT
I am reviewing QFT by going through An Introduction to Quantum Field Theory
by George Sterman and came across the section on Normal Ordering. I
understand that only the energy differences are observable so it is ok to
subtract the zero point energies. However the text does mention something
that has been bothering me for some time. It states - 'We ignore the
question of whether this is consistent with a theory of gravity' (page 44).
Of course a infinite zero point energy would mean an infinite gravitational
field so their does seem to be a problem here. However it would seem
inexorably tied up with cosmological constant problem which my understanding
is still a mystery. Does anyone know the latest take on the issue? Is it
believed super-symmetry solves the problem by the zero point energy of each
partner canceling the other out? If so then, while it would resolve the
above issue, the region where it kicks in would seem to be at an energy
level above that to resolve the cosmological constant problem.
Thanks
Bill
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