Stability of cosmic structures in scalar-tensor theories of gravity
  In the present work we study a concrete model of Scalar--Tensor theory of
gravity characterized by two free parameters, and compare its predictions
against observational data and constraints coming from supernovae, solar system
tests as well as the stability of cosmic structures. First an exact analytical
solution at the background level is obtained. Then using that solution the
expression for the turnaround radius is computed. Finally we show graphically
how current data and limits put bounds on the parameters of the model at hand.
