[astro-ph/0505253] Parametrization of Quintessence and Its P
Posted: May 13 2005
It is well known that minimally coupled quintessence potentials can not be reconstructed when w(z) crosses the line w=-1. Yet this paper uses arbitrary w(z) parametrizations and obtains potential reconstructions.
It seems that this is because the authors have not fitted their parametrizations to the SnIa data but instead they have used arbitrary parameter values which do not lead to crossing of the w=-1 line.
It seems that this is because the authors have not fitted their parametrizations to the SnIa data but instead they have used arbitrary parameter values which do not lead to crossing of the w=-1 line.