Title: Speeding up the Universe

Abstract: We are currently living an outstanding time in the field of cosmology and gravitation where more and more data are being collected constantly. One of the most puzzling questions that we cosmologists are facing nowadays is the
mysterious source that is driving our recent acceleration. One of the most accepted explanations to this phenomenon is a DE component. In the current talk, we present several DE models ranging from perfect fluid, imperfect fluid, scalar fields to 3-forms. We present observational constraints on them.  For those models that show a phantom or a phantom-like behaviour; i.e. where some energy condition violations take place,  it can be shown their harmlessness from a quantum point of view, i.e. the singularities or abrupt events they might induce are cured at the quantum level.