Quintom dark energy models with nearly flat potentials

Understand

We examine quintom dark energy models, produced by the combined consideration of a canonical and a phantom field, with nearly flat potentials and dark energy equation-of-state parameter $w_{DE}$ close to -1.

• We find that all such models converge to a single expression for $w_{DE}(z)$, depending only on the initial field values and their derivatives.
• We show that this quintom paradigm allows for a description of the transition through -1 in the near cosmological past.
• In addition, we provide the necessary conditions for the determination of the direction of the -1-crossing.