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

Abstract

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 $z_p\approx 0.41$, 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.

15 pages, 2 figures, version published in JCAP

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