tl:dr: possibly, but if so, it would be the size of the entire universe and, as a result, impossible for us to determine one way to the other.
this post was submitted on 19 Jun 2023
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This topic comes up from time to time. If you're interested, check this article by a cosmologist. https://www.preposterousuniverse.com/blog/2010/04/28/the-universe-is-not-a-black-hole/
Is your username in reference to Fast Fourier Transforms?
Haha, yes! I'be had it on many websites and it took someone on Lemmy to notice :)
Haha! I love them too! Super useful for audio applications.
You might want to check out this lemmy instance if you're into music production and audio stuff
Hehe, thanks I'll have a look!
I first learned about Fourier transforms during my bachelor in physics and hated it... Then, while doing my master's in astrophysics I re-discovered it for data analysis and music, thus my username... 😁
I didn't find any ArXiv links in the page, but the main point is this: given how flat the Universe is, if it is inside a black hole, it needs to be really large in order to keep the curvature inside so flat.