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.
All FRG computations in three dimensions use the exponential regulator, with optimal prefactorαopt≈4.65at LPA andαopt ≈1.30at DE2
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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.