2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217995We show that the vacuum condensate due to particle mixing is responsible of a dynamically evolving dark energy. In particular, we show that values of the adiabatic index close to -1 for vacuum condensates of neutrinos and quarks imply, at the present epoch, contributions to the vacuum energy compatible with the estimated upper bound on the dark energy.11 pagesHigh Energy Physics - Theorytext