2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205639The holographic conjecture for black holes localized on a 3-brane in Randall-Sundrum braneworld models RS2 predicts the existence of a classical 5D time dependent solution dual to a 4D evaporating black hole. After briefly reviewing recent criticism and presenting some difficulties in the holographic interpretation of the Gregory-Laflamme instability, we simulate some basic features of such a solution by studying null geodesics of the Schwarzschild black string, in particular those propagating nontrivially in the bulk, and using holographic arguments.15 pages, 2 figures, expanded version, including a discussion on the GL instability; to appear in Class. Quant. GravHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext