Self-Consistent Closure of Fractal Dimension, Nonextensive Statistics, and Non-Markovian Dynamics in Critical Systems
Self-organized critical systems often exhibit three macroscopic features simultaneously: nonextensive thermodynamics (quantified by the Tsallis index $q$), structural fractality (measured by the Hausdorff dimension $D$), and non-Markovian dynamics (characterized by the memory exponent $α$). Historically, these parameters have been treated as independent, to be empirically fitted case by case. Here we demonstrate that phase-space self-consistency imposes a unique algebraic closure: $α=D/(2D-1)$. This relation, together with $q=1+1/D$ derived from the extensivity of Tsallis entropy on fractal supports, yields the known result $α=1/(3-q)$ as a consequence, not as an independent assumption. The closure contains no free parameters and satisfies the physical boundary conditions $α(1)=1$ (ballistic transport in Euclidean spaces) and $α\to1/2$ as $D\to\infty$ (maximally subdiffusive regime). We validate the Troika relation across eight independent experimental systems, including seismicity, electromagnetic precursors, EEG, urban networks, botanical architectures, and space plasma. All measured values fall within error bars of the theoretical prediction, establishing the universality of the closure.