Abstract
In standard cosmology, dark energy and matter evolve independently, with no interaction. However, this seems to be a very special case. A much more generic approach would be that in which dark energy and matter actually interact, so the equations of conservation of energy for these components must be changed. We propose a model for this interaction together with a new model for the evolution of matter that lead to a bouncing universe, i.e., a universe that first goes through a phase of contraction before the expansion currently observed. We also try to model a universe without a bounce, but undergoing a phase of accelerated expansion, which is what is observed today.
