  We study the quantum gravitational collapse of spherically symmetric
pressureless dust. Using an effective equation derived from a polymer
quantization in the connection-triad phase space variables of general
relativity, we find numerically, for a variety of initial dust configurations,
that (i) trapped surfaces form and disappear as an initially collapsing density
profile evolves into an outgoing shockwave; (ii) black hole lifetime is
proportional to the square of its mass; and (iii) there is no mass inflation at
inner apparent horizons. These results provide a substantially different view
of black hole formation and subsequent evolution than found from semiclassical
analyses.
