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It is thought that there is another universe beyond the singularities of black holes. Is it because width of the light cones become zero at the singularity, meaning that you can cross infinite distance in a moment?

Also, is it the same 'other universe' as the regions 3 and 4 (white hole) of the Kruskal Diagrams? In that diagram region 4 seems not connected to r = 0 line of region 2 (singularity), and we seem to travel directly from 1 to 3 without ever encountaring any singularity if we travel at FTL speed. In short, is the hypothetical other universe behind the singularity same as the one in an Einstein Rosen Bridge?

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  • $\begingroup$ "It is thought that there is another universe beyond the singularities of black holes." By whom? $\endgroup$
    – TimRias
    Sep 22, 2021 at 12:57
  • $\begingroup$ Like this article. And many others.nationalgeographic.com/science/article/… $\endgroup$
    – Nayeem1
    Sep 22, 2021 at 14:17
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    $\begingroup$ It is thought so by virtually no one in physics, only in pop culture. $\endgroup$ Sep 22, 2021 at 14:35
  • $\begingroup$ That's what I am curious about. I don’t think National Geographic utterly lied unless some scientists also think the same. Let others answer if you can't. $\endgroup$
    – Nayeem1
    Sep 22, 2021 at 15:45
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    $\begingroup$ "We know exactly what happens beyond the horizon thanks to General Relativity. " That is not correct, GR is very successful where we can make measurements and observations, but we cannot measure or observe behind the horizon of a black hole. Before data showed us wrong physicists believed that classical mechanics and classical electrodynamics explained everything in the world and only engineering remained. The experiments in the microcosm of atoms proved that those theories were not enough, and quantum mechanics had to be invented to fit the data. Maybe in the future new observations from $\endgroup$
    – anna v
    Sep 22, 2021 at 17:44

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