Supernova light-curve fitters and Dark Energy

BENGOCHEA G. R.

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

Año: 2011 vol. 696 p. 5 - 12

0370-2693

We show that when a procedure is made to remove the tensionbetween a supernova Ia (SN Ia) data set and observations from BAOand CMB, there might be the case where the same SN Ia set builtwith two different light-curve fitters behaves as two separate anddistinct supernova sets, and the tension found by some authorsbetween supernova sets actually could be due to tension orinconsistency between fitters. We also show that the informationof the fitter used in an SN Ia data set could be relevant todetermine whether phantom type models are favored or not when sucha set is combined with the BAO/CMB joint parameter.