  Ghys and Sergiescu proved in the $80$s that Thompson's group $T$, and hence
$F$, admits actions by $C^{\infty}$ diffeomorphisms of the circle . They proved
that the standard actions of these groups are topologically conjugate to a
group of $C^\infty$ diffeomorphisms. Monod defined a family of groups of
piecewise projective homeomorphisms, and Lodha-Moore defined finitely
presentable groups of piecewise projective homeomorphisms. These groups are of
particular interest because they are nonamenable and contain no free subgroup.
In contrast to the result of Ghys-Sergiescu, we prove that the groups of Monod
and Lodha-Moore are not topologically conjugate to a group of $C^1$
diffeomorphisms.
  Furthermore, we show that the group of Lodha-Moore has no nonabelian $C^1$
action on the interval. We also show that many Monod's groups $H(A)$, for
instance when $A$ is such that $\mathsf{PSL}(2,A)$ contains a rational
homothety $x\mapsto \tfrac{p}{q}x$, do not admit a $C^1$ action on the
interval. The obstruction comes from the existence of hyperbolic fixed points
for $C^1$ actions. With slightly different techniques, we also show that some
groups of piecewise affine homeomorphisms of the interval or the circle are not
smoothable.
