Holographic dark energy in braneworld models with a Gauss-Bonnet term in the bulk. Interacting behavior and the \(w=-1\) crossing. (English) Zbl 1282.83084
Summary: We apply bulk holographic dark energy in general braneworld models with a Gauss-Bonnet term in the bulk and an induced gravity term and a perfect fluid on the brane. Without making any additional assumptions we extract the Friedmann equation on the physical brane and we show that a \(\rho -\rho \Lambda \) coupling arises naturally by the full 5D dynamics. The low-energy (late-time) evolution reveals that the effective 4D holographic dark energy behaves as “quintom”, that is it crosses the phantom divide \(w= - 1\) during the evolution. In particular, the Gauss-Bonnet contribution decreases the present value of w\(\Lambda \), while it increases the growing rate of w\(\Lambda (z)\) with \(z\), in comparison with the case where such a term is absent.
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