Quintessence dynamics with two scalar fields and mixed kinetic terms
  The dynamical properties of a model of dark energy in which two scalar fields
are coupled by a non-canonical kinetic term are studied. We show that overall
the addition of the coupling has only minor effects on the dynamics of the
two-field system for both potentials studied, even preserving many of the
features of the assisted quintessence scenario. The coupling of the kinetic
terms enlarges the regions of stability of the critical points. When the
potential is of an additive form, we find the kinetic coupling has an
interesting effect on the dynamics of the fields as they approach the
inflationary attractor, with the result that the combined equation of state of
the scalar fields can approach -1 during the transition from a matter dominated
universe to the recent period of acceleration.
