Smooth dynamical crossing of the phantom divide line of a scalar field in simple cosmological models

Simple scalar field cosmological models are considered describing gravity assisted crossing of the phantom divide line. This crossing or (de)-phantomization characterized by the change of the sign of the kinetic term of the scalar field is smooth and driven dynamically by the Einstein equations. Different cosmological scenarios, including the phantom phase of matter are sketched.

Figure 1

$h(t)$ dependence in our toy model.

Figure 2

$h(t)$ dependence in the model, describing the big rip.

Figure 3

$h(t)$ dependence in the model, describing a double crossing of the phantom divide line.