Observational challenges in dark energy models

BENGOCHEA G. R.

Mar del Plata, Prov. Buenos Aires

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2012

Instituto Argentino de Radioastronomía

Cosmological distances inferred from supernova Ia observationsconstitute the most direct and solid evidence for the recently detected accelerated expansion of the universe. In this contribution, we show some inconsistencies between two of the main light-curve fitters used for the elaboration of supernova Ia data sets, opening new observational challenges regarding the use of these luminosity distances when combined with CMB and BAO data. We also mention ongoing analysis related to alternative models. The resolution of these challenges will be crucial for XXI century cosmology.