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We construct a new brane-world model composed of a bulk -with a dilatonicfield-, plus a brane -with brane tension coupled to the dilaton-, cold darkmatter and an induced gravity term. It is possible to show that depending onthe nature of the coupling between the brane tension and the dilaton this modelcan describe the late-time acceleration of the brane expansion (for the normalbranch) as it moves within the bulk. The acceleration is produced together witha mimicry of the crossing of the cosmological constant line (w=-1) on thebrane, although this crossing of the phantom divide is obtained withoutinvoking any phantom matter neither on the brane nor in the bulk. The role ofdark energy is played by the brane tension, which reaches a maximum positivevalue along the cosmological expansion of the brane. It is precisely at thatmaximum that the crossing of the phantom divide takes place. We also show thatthese results remain valid when the induced gravity term on the brane isswitched off.

Crossing the cosmological constant line in a dilatonic brane-world model with and without curvature corrections