Quintom scalar field : Varying dark energy equation of state obtained
  from recent SNe Ia, BAO and OHD data
  From the analysis of Supernova Ia data alongwith Observational Hubble Data
(OHD) and Baryon Acoustic Oscillation (BAO) data, we attempt to find out the
nature of a scalar potential that may be responsible for the Dark Energy of the
universe. We demonstrate that in order to explain the varying dark energy
equation of state ($\omega_X(z)$) as obtained in a model independent way from
the analyses of observational data, we need to invoke a quintom scalar field
having a "quintessence" part for $\omega_X(z) > -1$ and a "phantom" part for
$\omega_X(z) < -1$. We consider a Gaussian type potential for these scalar
fields and compare the dark energy equation of state derived from such
potential with the one computed from the data analysis.
