Finite scale factor and future singularities
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The main characteristic of the dark energy is its negative pressure. In a homogeneous and isotropic FRW background, we consider several models for the dark energy fluid, which lead to finite time future singularities of the type I-IV, by introducing the pressure density as a function of the scale factor. This approach gives acceptable behavior of the dark energy equation of state. We give various numerical examples of models with type I-IV singularities, that show very similar late time behavior, making it difficult to determine the type of singularity that would take place in the future.
KeywordsDark energy Singularities
This work was supported by Universidad del Valle under project CI 71074 and by COLCIENCIAS grant number 110671250405.