Quantum black holes and resolution of the singularity

We present a quantum description of black holes as coherent states of gravitons which reproduce the Newtonian outer behaviour, with arbitrarily good approximation, but cannot resolve the classical central singularity because they do not contain modes of arbitrarily short wavelength. Quantum corrections to the outer potential are also estimated, which could result in observable effects for the gravitational collapse of compact objects and both astrophysical and microscopic black holes.