Re: Gaussian Intergals

On Jul 25, 3:28 pm, "Jay R. Yablon" <jyab...@xxxxxxxxxxxx> wrote:
In the formulas that Zee gives in his book, J is an externally
specified parameter independent of x. End of story. When x becomes a
vector or even a field, J is similarly extended. However, its
properties, as I just stated them, do not change.

So, Igor, are you saying that we effectively cut the cord between fields
and sources, i.e., that the sources are independent of the fields and
one has no relationship between them? You can call J an "externally
specified parameter independent of x," but in the end we associate it
J physically with a source and x with a field, and sources produce
fields. Sorry for the confusion, but I still am having trouble with
exactly what this means in terms of the relationship between sources
and fields in QFT.

What I say is precisely quoted above. Now, before you make any
interpretation of this statement beyond its literal meaning, it would
be helpful for you to state precisely which mathematical object do YOU
mean when you say "field" in the context of QFT. Just to avoid being
overly verbose, I recommend that you constrain your answer to no more
than a ten line paragraph.

Igor

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