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Honestly, I'd have no idea how to treat that operator to get any reasonable number. Therefore, imma take your word for it! Thank you!
we treat all functions of field operators as their taylor series expansion (hint)
Well sure, but what's it mean to apply a field with a negative exponent to a field with a positive exponent. Can you treat the operator expansion as inverse matrices? ( I'm still in the habit of expanding fields into c&a operators)
yea the reason we don't know how to treat those is because we never learn .. we never learn them becuase they diverge about 0 or small couplings and hence don't admit a perturbative expansion ..
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