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 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/

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.

Removed by mod

Removed by mod

Removed by mod

Removed by mod