On strong coupling scales in (minimal) massive gravity
  Ghost-free massive gravity models generically have a strong coupling scale of
$\Lambda_3 =(M_{\rm Pl} m^2)^{1/3}$. However, for one of these models -
`minimal massive gravity' - it is not clear what this scale is in the subset of
solutions with vanishing vector modes, since there are then no interactions at
the scale $\Lambda_3$. We show that there are always scalar-tensor interactions
at a scale arbitrarily close to $\Lambda_3$ around the Minkowski vacuum
solution. This explicitly confirms and completes previous research establishing
that $\Lambda_3$ effectively is the maximal strong coupling scale for all
ghost-free (dRGT) massive gravity models (on Minkowski). In the process, we
also revisit and clarify the construction of generic Lorentz-invariant massive
gravity models, explicitly constructing an improved non-redundant expansion for
these models.
