From Dark Energy to Dark Matter via Non-Minimal Coupling
  Toy 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. 
A. Borowiec (Wroclaw U., JINR Dubna)