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I was thinking about if Black Holes are 4th dimensional.

I know that spacetime inside a black hole scrambles (not sure if this is the correct term) very fast to produce more space, like a bag that is always getting deeper by the second, it's also why you cannot escape it.

Furthermore, as the Einstein-Rosen bridge idea states that black holes extend into the fourth dimension, at least to my understanding, and it's why you can entangle them via the 4th dimension, a wormhole.

To segway to my conclusion, would it be rational to think that a black hole is a 4th-dimensional sphere because of the Einstein-Rosen bridge theory, but without the entanglement? Just one black hole.

I apologize if this is obvious or a "stupid" question to ask. PS: I am not a math guy, so please try to avoid a mostly mathematical answer.

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  • $\begingroup$ "spacetime inside a black hole scrambles (not sure if this is the correct term) very fast to produce more space, like a bag that is always getting deeper by the second" - Something like this happens outside the horizon for an observer slowly approaching the horizon (not falling), but inside a Schwarzschild black hole space rapidly shrinks. "the Einstein-Rosen bridge idea states that black holes extend into the fourth dimension," - Also incorrect. There is no fourth spatial dimension in the bridge. The bridge takes you to a hypothetical different universe that also has 3 spatial dimensions. $\endgroup$ – safesphere Jul 1 at 19:26
  • $\begingroup$ Thanks for the clarification @safesphere $\endgroup$ – Compiler v2 Jul 1 at 19:43
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Yes, black holes are four-dimensional. Spacetime is four-dimensional (three dimensions of space and one dimension of time), and black holes are just a particular type of curved spacetime.

No, black holes are not four-dimensional spheres. For example, far from a black hole, spacetime is effectively flat rather than curved.

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  • $\begingroup$ Just a side note, because I'm curious, wouldn't that prove that higher dimensional space exists? And why do Physicists today say there are no higher dimensions or proof of such? $\endgroup$ – Compiler v2 Jun 30 at 2:35
  • $\begingroup$ They are talking about possible additional spatial dimensions. $\endgroup$ – G. Smith Jun 30 at 2:36
  • $\begingroup$ @Compilerv2 When you say 4th dimensional did you mean 4th spatial dimension or did you mean time as the 4th dimension? $\endgroup$ – Apoorv Khurasia Jun 30 at 2:36
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    $\begingroup$ Black holes do not have a fourth spatial dimension. $\endgroup$ – G. Smith Jun 30 at 2:37
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    $\begingroup$ @ApoorvKhurasia I hope you would agree that black holes do not require additional spatial dimensions, since they exist just fine in 3+1D GR. $\endgroup$ – G. Smith Jun 30 at 2:48

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