Screening mechanisms in hybrid metric-Palatini gravity
  We investigate the efficiency of screening mechanisms in the hybrid
metric-Palatini gravity. The value of the field is computed around spherical
bodies embedded in a background of constant density. We find a thin shell
condition for the field depending on the background field value. In order to
quantify how the thin shell effect is relevant, we analyze how it behaves in
the neighborhood of different astrophysical objects (planets, moons or stars).
We find that the condition is very well satisfied except only for some peculiar
objects. Furthermore we establish bounds on the model using data from solar
system experiments such as the spectral deviation measured by the Cassini
mission and the stability of the Earth-Moon system, which gives the best
constraint to date on $f(R)$ theories. These bounds contribute to fix the range
of viable hybrid gravity models.
