Lambda CDM-like models with future singularities

摘要

We consider new models of dark energy with finite time future singularities, by introducing the pressure density as a function of the scale factor. This approach gives acceptable phenomenological models of dark energy, that resemble that of the cosmological constant up to the present, which face future singularities at finite time and finite scale factor. Exact scalar field model representation was found for quintessence, Big Rip and type III singularity models. The simple form of the equation of state allows to establish a relationship between its current value, w(0), and the time or redshift at which the singularity takes place. The effect on the growth of matter perturbations is analyzed.