Topological Defect Statistics in a Weakly First-Order Phase Transition

Abstract

The celebrated Kibble-Zurek mechanism (KZM) characterizes the nonequilibrium dynamics of second-order phase transitions and predicts universal scaling of the average number of defects with the quench time. However, the KZM is not directly applicable to first-order phase transitions, where defect formation is instead governed by nucleation processes. Here, using a Ginzburg-Landau model, we investigate the defect-number statistics in a weakly first-order phase transition. We show that the resulting statistics contain signatures of both Kibble-Zurek dynamics and nucleation, revealing the interplay between these two defect-formation mechanisms. In particular, we find that the defect-number distribution evolves from approximately Gaussian to nearly Poissonian across the crossover from the KZM regime to nucleation-dominated defect formation. While the first two cumulants are well described by a simple additive estimate of the KZM and nucleation contributions, the third cumulant exhibits a plateau and an enhancement beyond this estimate, providing a sensitive probe of the interplay between the two defect-formation mechanisms.