2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179471We join quintessence cosmological scenarios with the duality simmetry existing in string dilaton cosmologies. Actually, we consider the tracker potential type $V = V_0/ϕ^α$ and show that duality is only established if $α= - 2$.6 LaTex Pages, submitted to Physics Letters A; completely revised version: majior changes in the last partHigh Energy Physics - Theorytext