Scalar-tensor cosmologies without screening
  Scalar-tensor theories are frequently only consistent with fifth force
constraints in the presence of a screening mechanism, namely in order to
suppress an otherwise unacceptably large coupling between the scalar and
ordinary matter. Here we investigate precisely which subsets of Horndeski
theories do not give rise to and/or require such a screening mechanism. We
investigate these subsets in detail, deriving their form and discussing how
they are restricted upon imposing additional bounds from the speed of
gravitational waves, solar system tests and cosmological observables. Finally,
we also identify what subsets of scalar-tensor theories precisely recover the
predictions of standard (linearised) $\Lambda\text{CDM}$ cosmologies in the
quasi-static limit.
