Observational issues in Dark Energy models

GABRIEL BENGOCHEA

Congreso; I CosmoSul; 2011

Observatorio Nacional - Río de Janeiro

In this presentation, I am going to show that when a procedure is made to remove the tension between a supernovae Ia (SNe Ia) data set and observations from BAO and CMB there might present the case where the same SNe Ia set built with two different light-curve fitters behaves as two separate and distinct supernovae sets, and the tension found by some authors between supernovae sets actually could be due to tension or inconsistency between fitters.I will also show that the information of the fitter used in a SNe Ia data set could be relevant when determining if phantom type models are favored or not when such a set is combined with the BAO/CMB joint parameter.