Dark energy loopholes some time after GW170817
  We revisit the constraints on scalar tensor theories of modified gravity
following the purge of GW170817. We pay particular attention to dynamical
loopholes where the anomalous speed of propagation of the gravitational wave
can vanish on-shell, when we impose the dynamical field equations. By working
in the effective field theory formalism we are able to improve on previous
analyses, scanning a much wider class of theories, including Beyond Horndeski
and DHOST. Furthermore, the formalism is well adapted to consider the effect of
inhomogeneous perturbations, where we explicitly take into account the fact
that the galactic overdensities are pressureless to leading order.
