Abstract
With a suitable decomposition of its energy-momentum tensor into pressureless matter and a vacuum type term, we investigate the spherical gravitational collapse of a minimally coupled, self-interacting scalar field, showing that it collapses to a singularity. The formed blackhole has a mass M sim 1/m (in Planck units), where m is the mass of the scalar field. If the latter has the axion mass, m sim 10^{-5} eV, the former has a mass M sim 10^{-5} M_{odot }.
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