2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/213348Toy cosmological models based on non-minimal coupling between gravity and scalar dilaton-like field are presented in the framework of Palatini formalism. They have the following property: preceding to a given cosmological epoch is a dark energy epoch with an accelerated expansion. The next (future) epoch becomes dominated by some kind of dark matter.6 pages in revtex, contribution to the special volume "Problems of Modern Cosmology", TSPU publishing - in pressGeneral Relativity and Quantum Cosmologytext