Cosmological dark fluid from five-dimensional vacuum

Abstract

In the framework of the induced matter theory of gravity, we derive a 5D solution of the field equations that can describe a 4D cosmological scenario where the dark fluid (dark matter plus dark energy) equation of state has a geometrical origin. There is no a natural separation of the dark sector into different components, and then the model may provide a geometrical explanation for the existence of a dark degeneracy in cosmological scenarios.

5 pages, under review in Physical Review D

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• The dark degeneracy and interacting cosmic components
• Revisiting Generalized Chaplygin Gas as a Unified Dark Matter and Dark Energy Model
• Modified Chaplygin Gas as a Unified Dark Matter and Dark Energy Model and Cosmic Constraints
• Unified Dark Fluid with Constant Adiabatic Sound Speed and Cosmic Constraints
• Extending the generalized Chaplygin gas model by using geometrothermodynamics
• Constraints on a decomposed dark fluid with constant adiabatic sound speed by jointing the geometry test and growth rate after Planck data
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• The Dynamical Evolution of 3-Space in a Higher Dimensional Steady State Universe
• Spherical Collapse of a Unified Dark Fluid with Constant Adiabatic Sound Speed
• Unified dark fluid with fast transition: including entropic perturbations
• $\Lambda$CDM cosmology with a quiescent anisotropy in a higher dimensional steady state universe
• 3+2 Cosmology: unifying FRW metrics in the bulk