Phantom without ghost
  The Nine-Year WMAP results combined with other cosmological data seem to
indicate an enhanced favor for the phantom regime, comparing to previous
analyses. This behavior, unless reversed by future observational data, suggests
to consider the phantom regime more thoroughly. In this work we provide three
modified gravitational scenarios in which we obtain the phantom realization
without the appearance of ghosts degrees of freedom, which plague the naive
approaches on the subject, namely the Brans-Dicke type gravity, the
scalar-Einstein-Gauss-Bonnet gravity, and the $F(R)$ gravity, which are
moreover free of perturbative instabilities. The phantom regime seems to favor
the gravitational modification instead of the universe-content alteration.
