The authors derive exact flow equations for the constraint effective action in the Ising class using FRG, solve them numerically at second-order derivative expansion for 2D and 3D systems, extract universal rate functions and momentum-dependent correlations, and benchmark against Monte Carlo.
Sahu, Critical probability distributions of the order parameter at two loops II:O(n)universality class, arXiv:2503.21799 (2025)
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Constraint effective action and critical correlation functions at fixed magnetization
The authors derive exact flow equations for the constraint effective action in the Ising class using FRG, solve them numerically at second-order derivative expansion for 2D and 3D systems, extract universal rate functions and momentum-dependent correlations, and benchmark against Monte Carlo.