Except for some peculiar circumstances, the evaporation of black holes by the Hawking Process doesn't remove the event horizon, so our spacetime/universe never gets to see these naked singularities. Even if singularities did appear, they would not produce a new universe on top of our own because they are the wrong type of singularity. Black holes in our universe are embedded in our spacetime, but our universe is not an embedded object in general relativity, so a black hole cannot transform our universe into a new Big Bang. But, Hawking has speculated that perhaps black holes in our universe might spawn other universes 'elsewhere'. As you can imagine, there is no way to verify this scientifically so we can only regard such speculations as a kind of modern-age fiction.
Copyright 1997 Dr. Sten Odenwald
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