Holographic Dark Energy in Braneworld Models with Moving Branes and the w=-1 Crossing

Details Holographic Dark Energy in Braneworld Models with Moving Branes and the w=-1 Crossing Holographic Dark Energy in Braneworld Models with Moving Branes and the w=-1 Crossing

2007-12-17

arxiv.org/abs/0712.2672v2

JCAP 0804:020,2008

Astronomy and Astrophysics

Astrophysics

15 pages, 2 figures, version published in JCAP

Scientific paper

10.1088/1475-7516/2008/04/020

We apply the bulk holographic dark energy in general 5D two-brane models. We extract the Friedmann equation on the physical brane and we show that in the general moving-brane case the effective 4D holographic dark energy behaves as a quintom for a large parameter-space area of a simple solution subclass. We find that $w_\Lambda$ was larger than -1 in the past while its present value is $w_{\Lambda_0}\approx-1.05$, and the phantom bound $w_\Lambda=-1$ was crossed at $z_{p}\approx0.41$, a result in agreement with observations. Such a behavior arises naturally, without the inclusion of special fields or potential terms, but a fine-tuning between the 4D Planck mass and the brane tension has to be imposed.

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