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Results tagged with wick-theorem
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user 251344
A combinatoric procedure in QFT of reducing arbitrary products of creation and annihilation operators to sums of products of pairs of these operators. A string of such operators is rewritten as the normal-ordered product of the string, plus the normal-ordered product after all single contractions among operator pairs, plus all double contractions, etc., plus all full contractions.
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Normal ordered product of $4$ scalar fields $X^\mu$
I'm trying to get more familiarity with the conformal normal ordering used in Polchinski's String Theory vol. 1 and I'm currently trying to solve problem $2.2$ which asks to prove that the normal orde …
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Trying to derive Polchinski's equation $(2.2.11)$
I'm having trouble to derive Polchinski's equation $(2.2.11)$ which is an example of product of normal ordered product of $\partial X^\mu$. Precisely, Polchinski defines the product of normal ordered …