Anomalous diffusion phenomena occur on length scales spanning from the intracellular to the astrophysical range. A specific form of decay at large argument of the probability density function of rescaled displacement (scaling function) is derived and shown to imply universal singularities in the normalized cumulant generator. Exact calculations for continuous time random walks provide paradigmatic examples connected with singularities of second order phase transitions. In the biased case scaling is restricted to displacements in the drift direction and singularities have no equilibrium analogue.
Reference: A. L. Stella, A. Chechkin, and G. Teza, Anomalous dynamical scaling determines universal critical singularities, arXiv preprint arXiv:2209.02042