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

Abstract

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 can 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 Type III and Type IV cases. Specifically, some interesting effects coming from the brane tension are investigated. It is shown, in particular, that the Little Rip occurs faster on the brane model than in 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 that corresponding to ordinary dark energy. As a consequence, the value of the inertial force from the accelerating expansion can greatly exceed the corresponding inertial force in ordinary cosmological models.

13 pages, more extense discussion, references added

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• Inhomogeneous Dark Fluid and Dark Matter, Leading to a Bounce Cosmology
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• Fluid inflation with brane correction
• Rip brane cosmology from a viscous holographic dark fluid
• Viscous Accelerating Universe with Non-linear and Logarithmic Equation of State Fluid
• Little Rip, Pseudo Rip and bounce cosmology with generalized equation of state in non-standard backgrounds
• Brane cosmology from observational surveys and its comparison with standard FRW cosmology
• Holographic bounce cosmological models induced by viscous dark fluid from a generalized non-singular entropy function
• Holographic description of unified early and late universe in viscous mimetic gravity
• Rip Cosmology via Inhomogeneous Fluid