Quintessence duality
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We 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 part
6 LaTex Pages, submitted to Physics Letters A; completely revised version: majior changes in the last part