On 21 December 2013 22:18, Bruno Marchal <marc...@ulb.ac.be> wrote:

> On 20 Dec 2013, at 18:48, Richard Ruquist wrote:
> Bruno:  In that case a multiverse could contain another multiverse, a bit
> like a black hole could be a door to another universe.
> Richard: I like that idea because Smolin hypothized and Poplawski
> confirmed using GR + spin that black holes yield at least an internal
> universe.
> Interesting. Wish I could follow this more closely.
> I think this is shown by the Penrose diagram of a rotating black hole, if
I remember correctly. I certainly wrote a science fiction story on that
basis once!

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