The transition of equation of state of effective dark energy in the DGP model with bulk contents

Abstract

We investigate the effect of the bulk contents in the DGP braneworld on the evolution of the universe. We find that although the pure DGP model cannot accommodate the transition of the effective equation of state of dark energy, once the bulk matter T^5_5 is considered, the modified model can realize the w_{eff} crossing -1. However this transition of the equation of state cannot be realized by just considering bulk-brane energy exchange or the GB effect while the bulk matter contribution is not included. T^5_5 plays the major role in the modified DGP model to have the w crossing -1 behavior. We show that our model can describe the super-acceleration of our universe with the equation of state of the effective dark energy and the Hubble parameter in agreement with observations.

25 pages, 11 figures, revised version, accepted for publication in Phys. Rev. D

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• Metastable dark energy
• Fractional dark energy
• The Dark Sector Cosmology
• A note on interacting holographic dark energy with a Hubble-scale cutoff
• Constraints on interacting dark energy revisited: implications for the Hubble tension
• Backreaction of superhorizon perturbations in scalar field cosmologies
• A Lorentz Invariance Violating Cosmology on the DGP Brane
• Dark Energy and Modified Scale Covariant Theory of Gravitation