Abstract
The current observational data imply that the universe would end with a cosmic doomsday in the holographic dark energy model. However, unfortunately, the big-rip singularity will ruin the theoretical foundation of the holographic dark energy scenario. To rescue the holographic scenario of dark energy, we employ the braneworld cosmology and incorporate the extra-dimension effects into the holographic theory of dark energy. We find that such a mend could erase the big-rip singularity and leads to a de Sitter finale for the holographic cosmos. Therefore, in the holographic dark energy model, the extra-dimension recipe could heal the world.
Highlights
Dark energy was found by the observations of type Ia supernovae in 1998 [1]
The vacuum energy density is of order 10−47GeV4, which appears to require the introduction of a new mass scale 14 or so orders of magnitude smaller than the electroweak scale
We find that the extra dimension mechanism would provide us with a good cure for the illness of the holographic dark energy model
Summary
Dark energy was found by the observations of type Ia supernovae in 1998 [1]. It is believed that the current cosmic acceleration is caused by dark energy. The holographic principle may lead to a dark energy model that is based on the effective quantum field theory with a UV/IR duality. Instead of the Hubble horizon, one can choose the event horizon of the universe as the IR cutoff of the theory [13] This choice gives a reasonable value for dark energy density, and gives rise to an acceleration solution for the cosmic expansion. The joint analysis of the latest observational data, including type Ia supernovae (SN), cosmic microwave background (CMB), and baryon acoustic oscillation (BAO), shows that the parameter c is less than 1 (at nearly 2 σ level): c It seems that the big rip is inevitable in the holographic dark energy model.
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