2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211573In critical phenomena, singular behaviors arise not only for thermodynamic quantities but also for transport coefficients. We study this dynamic critical phenomenon in the AdS/CFT duality. We consider black holes with a single R-charge in various dimensions and compute the R-charge diffusion in the linear perturbations. In this case, the black holes belong to model B according to the classification of Hohenberg and Halperin.17 pages, ReVTeX4; v2: added references and discussionHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext