Universal finite-size scaling in high-dimensional critical phenomena (2412.08814v1)

Abstract: We present a new unified theory of critical finite-size scaling for lattice statistical mechanical models with periodic boundary conditions above the upper critical dimension. The universal finite-size scaling is inherited from the scaling of the system unwrapped to the infinite lattice. A Wilsonian renormalisation group analysis determines a universal profile for the susceptibility and two-point function plateau. Our theory is based on recent mathematically rigorous results for linear and branched polymers, multi-component spin systems, and percolation. Both short-range and long-range interactions are included. With free boundary conditions, the universal scaling applies at a pseudocritical point.