2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35117Here, non-minimally coupled tachyon to gravity is considered as a source of "dark energy". It is demonstrated that with expansion of the universe, tachyon dark energy decays to "dark matter" providing a solution to "cosmic coincidence problem".Moreover, it is found that universe undergoes accelerated expansion simultaneously.19 pagesGeneral Relativity and Quantum CosmologyAstrophysicstext