Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-09-07
Phys. Rev. D 85 (2012), 043010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
16 pages, 3 figure, 1 table. Final version in PRD
Scientific paper
It is found by Cai and Su that the interaction between dark energy and cold dark matter is likely to change the sign during the cosmological evolution. Motivated by this, we suggest a new form of interaction between dark energy and dark matter, which changes from negative to positive as the expansion of our universe changes from decelerated to accelerated. We find that the interacting model is consistent with the second law of thermodynamics and the observational constraints. And, we also discuss the unified adiabatic-squared sound speed of the model.
Sun Cheng-Yi
Yue Rui-Hong
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