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As discussed in this question, as far back as the 1960s it was suggested that the Schwarzschild metric can be smoothly joined to a de Sitter metric. For example the idea has been used by Lee Smolin in his ideas idea for black hole evolution.

If the suggestion is true it means that matter falling into a black hole would emerge into a de Sitter spacetime arguably comparable to our own.

So has the universe we live in started as a black hole of this type?

Is it possible to prove that the big bang was a black hole of this type?

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  • $\begingroup$ No conclusive evidence so far. Big bang theory is the most widely accepted due to several facts that seem to support it, but there are still open questions. So it remains still a theory. $\endgroup$ – rmhleo Sep 19 '14 at 12:22
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    $\begingroup$ Do you have any reliable references for what you mean by "imploding black hole", and could you explain why this is a posible explanation of the big bang? $\endgroup$ – ACuriousMind Sep 19 '14 at 13:45
  • $\begingroup$ duplicate of physics.stackexchange.com/q/3294 $\endgroup$ – Ben Crowell Oct 30 '14 at 15:42
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Although there are suggestions that a black hole could lead into another expanding universe you should regard these as highly speculative. Although the metrics can be stitched together it requires a contribution from currently hypothetical quantum gravity effects. Until we have a working theory of quantum gravity there is no way to comment on how likely the scenario is.

To date the constructions link the Schwarzschild metric to a de Sitter universe, and our universe is not de Sitter (though in the future it will tend asymptotically towards de Sitter geometry). So on the face of it our universe does not look as though it is the far side of a black hole. Having said this, the effect of matter wasn't included in the original models as it makes the calculation too hard. It is conceivable that matter falling into the black hole would emerge to produce a universe that looks like ours. At the current state of the art it just isn't possible to comment definitively.

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    $\begingroup$ I imagine the answer is along the same lines as "it's impossible to say right now," but I'm curious: in theories that link black holes to new universes, is the energy of this new universe constrained by the mass/energy of the black hole? I'd be curious how this new universe interplays with Hawking radiation, but that is perhaps a question for another time. $\endgroup$ – zibadawa timmy Sep 20 '14 at 6:13
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    $\begingroup$ @zibadawatimmy: to be honest I don't understand the maths well enough to comment. However note that energy is generally not conserved in an expanding universe because it violates time shift symmetry. There is no requirement for the new universe to have the same energy as the black hole it came from. $\endgroup$ – John Rennie Sep 20 '14 at 9:34
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The scenario you are talking about may have taken place as a sort of a "Big bounce".

Big bounce is the theory of a cyclic universe implying that the big bang in the past will be followed by a big crunch in the future, followed again by a new big bang and so on.

However, currently a future big crunch is considered as less probable because it seems that today our universe is accelerating.

Nevertheless, even if a future big crunch seems less probable this does not exclude that the big bang was preceded by a big crunch in the past.

Big Crunch is one possible scenario in which the universe collapses, ultimately ending as a black hole singularity, and possibly causing the formation of the universe starting with a big bang.

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My answer to your question is an absolute "no". First of all Black holes do not implode, that would suggest them blowing up in some way, they can grow but to say implode is null.

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