The large-N O(N) universality class is conformally invariant at criticality, established by functional and vertex-by-vertex proofs in the NPRG framework.
Then we have used thatDx acts on both arguments of G[x, x], and thus R zδ(x−z)D z G[z, x] = 1 2 DxG[x, x], and similarly forG0(x, x) Using Eqs
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Conformal Invariance of the large-$N$ limit of the $O(N)$ universality class
The large-N O(N) universality class is conformally invariant at criticality, established by functional and vertex-by-vertex proofs in the NPRG framework.