Dark Energy-Dark Matter Interaction from the Abell Cluster A586
  We find that deviation from the virial equilibrium of the Abell Cluster A586 yields evidence of the interaction between dark matter and dark energy. We argue that this interaction might imply a violation of the Equivalence Principle. Our analysis show that evidence is found in the context of two different models of dark energy-dark matter interaction. 
Orfeu Bertolami, Francisco Gil Pedro, Morgan Le Delliou