IA/U.Lisboa Seminar - Is the universe heading towards a violent end? - 7 junho 2016

IA/U.Lisboa

 

 

General Relativity contains inherently singularities, which refer to geodesically incomplete spacetimes, according to the usual definitions by Hawking and Ellis. Over the last years, what is called in the literature by "future cosmological singularities" have drawn much attention within the scientific community, since some dark energy models lead the universe to one of these "singularities". In this talk, I will review and show the physical features of these singularities, and then present several phenomenological parameterizations of the Hubble expansion rate to model different singularities existing in the literature and use SN Ia, BAO and H(z) data to constrain how far in the future the singularity needs to be, and how good the parametrizations are in comparison with the concordance model in cosmology.