2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186908In this paper, the quasinormal modes of gravitational perturbation around a Schwarzschild black hole surrounded by quintessence were evaluated by using the third-order WKB approximation. Due to the presence of quintessence, the gravitational wave damps more slowly.General Relativity and Quantum CosmologyAstrophysicstext