1206.2192 (Artyom V. Astashenok et al.)

Equation-of-state formalism for dark energy models on the brane and the future of brane universes    [PDF]

Artyom V. Astashenok, Emilio Elizalde, Sergei D. Odintsov, Artyom V. Yurov

Brane dark energy cosmologies, leading to various possible evolutions of our universe, are investigated. The discussion shows that while all these models can be made arbitrarily close to the standard $\Lambda$CDM cosmology at present, their future evolutions could be very different, even diverge with time in a number of ways. This includes asymptotic de-Sitter evolution, Little Rip with dissolution of bound structures, and various possible singularities, as the Big Rip, a sudden future singularity (Type II), and those of Type III and Type IV cases. Specifically, very interesting effects which arise as a consequence of the brane tension are investigated. Thus, it is shown that the Little Rip occurs faster on the brane model than in the usual FRW cosmology. And, in the asymptotic de-Sitter regime, the influence of the brane tension leads to a deviation of the value of the effective cosmological constant from the one corresponding to ordinary dark energy. As a consequence, the value of the inertial force from the accelerating expansion can much exceed the corresponding inertial force in ordinary cosmological models.

View original: http://arxiv.org/abs/1206.2192