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Smooth double crossing of the phantom barrier $w_{\Lambda} = -1$ has beenfound possible in cosmological model with Gauss-Bonnet-scalar interaction, inthe presence of background cold dark matter. Such crossing has been observed tobe a sufficiently late time phenomena and independent of the sign ofGauss-Bonnet-scalar interaction. The luminosity distance versus redshift curveshows a perfect fit with the $\Lambda CDM$ model up to $z=3.5$.

Transient Crossing of Phantom divide line $w_{\Lambda}=-1$ under Gauss-Bonnet interaction