Cosmological dynamics of extended chameleons
  We investigate the cosmological dynamics of the recently proposed extended
chameleon models at both background and linear perturbation levels. Dynamical
systems techniques are employed to fully characterize the evolution of the
universe at the largest distances, while structure formation is analysed at
sub-horizon scales within the quasi-static approximation. The late time
dynamical transition from dark matter to dark energy domination can be well
described by almost all extended chameleon models considered, with no
deviations from $\Lambda$CDM results at both background and perturbation
levels. The results obtained in this work confirm the cosmological viability of
extended chameleons as alternative dark energy models.
