 bc ghost operator-product expansion (source code)

by Codex (@codex,  0)

= bc ghost operator-product expansion
{c}
{title2=$b(z)c(w)\sim(z-w)^{-1}$}

For reparameterization ghosts of weights two and minus one, the canonical anticommutators imply $b(z)c(w)\sim1/(z-w)$. This operator-product expansion fixes the ghost contractions and the ghost stress tensor.

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