Comment by jadbox
Not my field, but could the Big Bang have been a massive black hole that "spat" out jets of plasma that formed into new stars and galaxies? I call this the black hole big burp theory.
Not my field, but could the Big Bang have been a massive black hole that "spat" out jets of plasma that formed into new stars and galaxies? I call this the black hole big burp theory.
I'm sure it's not practical, but I always thought it would be interesting if instead of living "inside" a black hole, the visible universe was simply being consumed by a black hole so large it just encompassed everything outside the visible part. So no nesting, the universe just eventually gets consumed entirely by one black hole.
Isn't universe inflation already on shaky ground though? https://www.scientificamerican.com/article/cosmic-inflation-...
Interesting read. Her proposal for a “bounce” cosmology sounds like it has a neat explanation for why things appear smooth, but as far as why/how the universe should bounce at all (especially given current consensus that the current universe will NOT bounce) are only briefly gestured at (“promising recent work”, to paraphrase).
Has that work developed and found traction among physicists in the 7 years since the article?
This was on the front page a couple weeks back iirc: https://www.livescience.com/physics-mathematics/dark-matter/...
Interesting! It would be nice to solve dark matter & excise inflation in one stroke (or a few strokes). My lay understanding of PBHs—as-dark-matter is that it has been whittled down to a pretty tight range of their masses, though, bounded by “they would’ve already evaporated” and “we’d already have detected them”
This is very close to an idea known as "Black hole cosmology" -- basically the idea being that the visible universe is inside a black hole, leading to a sort of "nested multiverse".
https://en.wikipedia.org/wiki/Black-hole_cosmology
A related theory, rather than being inside a black hole, is that the other side of a black hole is a "white hole". As matter collapses into a black hole, it is emitted from the white hole, creating another universe.
Here's an article from 2010 that expands on the idea, though this is definitely not the first time (or last time) it was discussed, it just happens to be an easily searchable article.
https://www.space.com/8293-universe-born-black-hole-theory.h...