  This paper deals with dark and phantom energy in the tachyon and sub-quantum
models for dark energy. We obtain that the simplest condition for such a regime
to occur in these scenarios is that the scalar field be Wick rotated to
imaginary values which correspond to an axionic field classically. By
introducing analytical expressions for the scale factor or the Hubble parameter
that satisfy all constraint equations of the used models we show that such
models describe universes which develop a big rip singularity in the finite
future.
