ON THE CONVERGENCE OF THE EXPANSION OF RENORMALIZATION GROUP FLOW EQUATION

G. PAPP, B.-J. SCHAEFER, J. WAMBACH, H.-J. PIRNER
2001 Non-Perturbative QFT Methods and Their Applications  
We compare and discuss the dependence of a polynomial truncation of the effective potential used to solve exact renormalization group flow equation for a model with fermionic interaction (linear sigma model) with a grid solution. The sensitivity of the results on the underlying cutoff function is discussed. We explore the validity of the expansion method for second and first-order phase transitions.
doi:10.1142/9789812799968_0016 fatcat:uf2eddoyknhdda5dpf3t2gcg6a