Lawrence Krauss: Observing a Baby Universe's Expansion

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Lawrence Krauss Lecuture: What a baby expanding universe may look like from "outside"

I watched a lecture by Krauss a while back


one of the questions that was asked near the end was that if it was possible that quantum fluctuations could produce a baby universe within our own and if we'd be able to observe this.

Part of Krauss' response was that from inside this baby universe would be exponentially expanding but from outside it will look like it was collapsing to form a black hole so we wouldn't be completely sure.

my question is, why would this baby universe appear like a collapsing black hole?
 
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Not sure. That's one I've never heard of before. Perhaps something to do with the way spacetime warps inside a black hole?
 


Read The Inflationary Universe by Alan Guth he discusses this issue