  Particle creation has been considered as a possible justification for the
accelerated expansion of the universe, obeying the second law of
thermodynamics, together with the possible existence of Dark Energy. This paper
introduces the possibility that the destruction of baryonic and/or dark matter
particles also verifies the second law of thermodynamics thanks to a particle
exchange with dark energy. General equations for the variation of the number of
particles in accelerated universes have been obtained. Finally, a new model of
the universe has been developed which predicts dark energy properties as well
as particle exchange processes between dark energy and baryonic and/or dark
matter.
