Tsujikawa, Phys. Rev. D 77, 023507 (2008)

We examine the asymptotic behavior of w eff in the limitby taking the leading term in terms of .No. 32q > 1・ For [Type I (“Big Rip”) singularity],we ff evolves from the non-phantom phase or the phantom oneand asymptotically approaches .w eff = à 1・0 < q < 1For [Type III singularity],evolves from the non-phantom phase to the phantom onewith realizing a crossing of the phantom divide orevolves in the phantom phase.w effà 1 < q < 0The final stage is the eternal phantom phase.・For [Type II (“sudden”) singularity],at the final stage.w eff > 0