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It is found by Cai and Su that the interaction between dark energy and colddark matter is likely to change the sign during the cosmological evolution.Motivated by this, we suggest a new form of interaction between dark energy anddark matter, which changes from negative to positive as the expansion of ouruniverse changes from decelerated to accelerated. We find that the interactingmodel is consistent with the second law of thermodynamics and the observationalconstraints. And, we also discuss the unified adiabatic-squared sound speed ofthe model.

New Interaction between Dark Energy and Dark Matter Changes Sign during Cosmological Evolution