Cubic Derivative Interactions and Asymptotic Dynamics of the Galileon
  Vacuum
  In this paper we apply the tools of the dynamical systems theory in order to
uncover the whole asymptotic structure of the vacuum interactions of a galileon
model with a cubic derivative interaction term. It is shown that, contrary to
what occurs in the presence of background matter, the galileon interactions of
vacuum appreciably modify the late-time cosmic dynamics. In particular, a local
late-time attractor representing phantom behavior arises which is inevitably
associated with a big rip singularity. It seems that the gravitational
interactions of the background matter with the galileon screen the effects of
the gravitational self-interactions of the galileon, thus erasing any potential
modification of the late-time dynamics by the galileon vacuum processes. Unlike
other galileon models inspired in the DGP scenario, self-accelerating solutions
do not arise in this model.
