2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189797We analyze the AdS/CFT dual geometry of an expanding boost-invariant plasma. We show that the requirement of nonsingularity of the dual geometry for leading and subasymptotic times predicts, without any further assumptions about gauge theory dynamics, hydrodynamic expansion of the plasma with viscosity coefficient exactly matching the one obtained earlier in the static case by Policastro, Son and Starinets.5 pages, no figures; v2: title changed in journal, version to appear in Phys. Rev. LettHigh Energy Physics - TheoryGeneral Relativity and Quantum CosmologyHigh Energy Physics - PhenomenologyNuclear Theorytext