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I have read this question:

Is the observable universe analogous to a white hole?

But it does not have a satisfying answer.

And this one:

Is the observable region of the universe within the event horizon of a super-massive black hole?

Are we inside a black hole?

This one says that we are not inside a black hole, because:

  1. The large scale geometry of the universe is described by the Friedmann-Lemaitre-Robertson-Walker metric.

  2. The geometry of the spacetime of a black hole (in its simplest form) is described by the Schwarzschild metric.

Now here:

The largest black hole

Safesphere's comment says that our universe is inside a white hole.

Question:

  1. Which one is it, is our universe inside a black hole or a white hole or none?
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  • $\begingroup$ According to the standard model of cosmology (Lambda-CDM), neither. $\endgroup$
    – G. Smith
    Commented Apr 10, 2019 at 3:53
  • $\begingroup$ @G.Smith Actually, $\Lambda\text{CDM}$ is consistent with the universe being an Oppenheimer-Snyder white hole. Both are described by the same Friedmann metric and therefore cannot be distinguished by observations. $\endgroup$
    – safesphere
    Commented Aug 20, 2019 at 7:30

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