2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53088Recently, it was suggested that the system of smeared black branes might provide a counter example to the Gubser-Mitra conjecture. Concerning to this issue, we have investigated the s-wave perturbation analysis to see how the stability of such system behaves. Some partial results are reported in this meeting.5 pages, 1 figure, a talk given at the 14th Workshop on General Relativity and Gravitation(JGRG14) held at Yukawa Institute for Theoretical Physics in Japan, Nov. 29 - Dec. 3, 2004High Energy Physics - Theorytext