Inhomogeneous cosmological models and $H_0$ observations
  We address some recent erroneous claim that $H_0$ observations are difficult
to accommodate with LTB cosmological models, showing how to construct solutions
in agreement with an arbitrary value of $H_0$ by re-writing the exact solution
in terms of dimensionless parameters and functions. This approach can be
applied to fully exploit LTB solutions in designing models alternative to dark
energy without making any restrictive or implicit assumption about the
inhomogeneity profile. The same solution can also be used to study structure
formation in the regime in which perturbation theory is not enough and an exact
solution of the Einstein's equation is required, or to estimate the effects of
a local inhomogeneities on the apparent equation of state of dark energy.
