Confronting Phantom Dark Energy with Observations
  We confront two types of phantom dark energy potential with observational
data. The models we consider are the power-law potential, $V\propto
{\phi}^{\mu}$, and the exponential potential, $V\propto
\exp({\lambda}{\phi}/{M_P})$. We fit the models to the latest observations from
SN-Ia, CMB and BAO, and obtain tight constraints on parameter spaces.
Furthermore, we apply the goodness-of-fit and the information criteria to
compare the fitting results from phantom models with that from the cosmological
constant and the quintessence models presented in our previous work. The
results show that the cosmological constant is statistically most preferred,
while the phantom dark energy fits slightly better than the quintessence does.
