Global Conformal Invariance and Bilocal Fields with Rational Correlation Functions

Nikolay M. Nikolov, Yassen S. Stanev, Ivan T. Todorov

The singular part of the \textit{operator product expansion} (OPE) of a pair of \textit{globally conformal invariant} (GCI) scalar fields $\varphi$ of (integer) dimension $d$ can be writ…