Accelerating Horndeski cosmologies screening the vacuum energy
  In the context of Horndeski cosmologies, we consider a dynamical adjustment
mechanism able to screen any value of the vacuum energy of the matter fields
leading to a fixed de Sitter geometry. Thus, we present the most general
scalar-tensor cosmological models without higher than second order derivatives
in the field equation that have a fixed spatially flat de Sitter critical point
for any kind of material content or vacuum energy. These models allow us to
understand the current accelerated expansion of the universe as the result of
the evolution towards the critical point when it is an attractor.
