Recent observations from type Ia Supernovae and from cosmic microwave background (CMB) anisotropies have revealed that most of the matter of the Universe interacts in a repulsive manner, composing the socalled dark energy constituent of the Universe. The analysis of cosmic gravitational waves (GW) represents, besides the CMB temperature and polarization anisotropies, an additional approach in t...

In this paper, we study in FRW universe the interaction between viscous Chaplygin gas and dark energy modified gravity theory F(R,T), where T R are trace of energy-momentum tensor is Ricci scalar respectively. model, dominated by both components energy. We discuss effect bulk viscosity on state parameter, was carried for two interactions after obtaining Friedmann equations. Finally, found that ...