- Some physicists have theorized that the universe could be inside a black hole based on mathematical similarities between black hole singularities and the Big Bang. - Both black holes and the Big Bang involve infinite densities where Einstein’s theory of general relativity breaks down. - Black holes and the early universe both have event horizons beyond which light and matter cannot escape. - The interior of a white hole, which is the time reverse of a black hole, resembles the expanding universe with a past singularity. - An FLRW metric, which describes our homogeneous and isotropic universe, can be embedded inside both black holes and white holes. - If a white hole was large enough, its interior could be indistinguishable from our observable universe. - Hawking radiation suggests black holes and white holes may be equivalent objects. - Cosmological natural selection proposes universes are born from white holes formed by black hole collapse. - If our universe is inside a black hole, the exterior could contain other universes with observers making the same conjecture. - While intriguing, there is currently no conclusive evidence that our universe is within a black hole.
as usual with weird hypotheses, pbs spacetime covers them nicely and discusses the caveats:
this does not seem to consider the possibility that compactified dimensions are because of a black hole, and I suspect that that would be a misunderstanding of string theory, though I’m not a physicist either. see also their other stuff about black holes, https://www.youtube.com/@pbsspacetime/search?query=black%20hole, and https://www.youtube.com/@ScienceClicEN which has one of, my favorite, visualizations of, relativity (though maybe still not the most true one possible?)
and see also high quality though less, relevant, others, if, you, want, deeper, physics, lectures
kagi summary of the video:
- Some physicists have theorized that the universe could be inside a black hole based on mathematical similarities between black hole singularities and the Big Bang.
- Both black holes and the Big Bang involve infinite densities where Einstein’s theory of general relativity breaks down.
- Black holes and the early universe both have event horizons beyond which light and matter cannot escape.
- The interior of a white hole, which is the time reverse of a black hole, resembles the expanding universe with a past singularity.
- An FLRW metric, which describes our homogeneous and isotropic universe, can be embedded inside both black holes and white holes.
- If a white hole was large enough, its interior could be indistinguishable from our observable universe.
- Hawking radiation suggests black holes and white holes may be equivalent objects.
- Cosmological natural selection proposes universes are born from white holes formed by black hole collapse.
- If our universe is inside a black hole, the exterior could contain other universes with observers making the same conjecture.
- While intriguing, there is currently no conclusive evidence that our universe is within a black hole.