Felix has a new preprint on arXiv titled “Operator product expansion coefficients from the nonperturbative functional renormalization group”!

Using the nonperturbative functional renormalization group (FRG) within the Blaizot-Méndez-Galain-Wschebor approximation, we compute the operator product expansion (OPE) coefficient c₁₁₂ associated with the operators 𝒪₁∼φ and 𝒪₂∼φ² in the three-dimensional O(N) universality class and in the Ising universality class (N=1) in dimensions 2≤d≤4. When available, exact results and estimates from the conformal bootstrap and Monte-Carlo simulations compare extremely well to our results, while FRG is able to provide values across the whole range of d and N considered.

 

Operator product expansion coefficients from the nonperturbative functional renormalization group

• F. Rose, C. Pagani, N. Dupuis, Operator product expansion coefficients from the nonperturbative functional renormalization group, arXiv:2110.13174