If the plasma jet is wildly larger than our entire galaxy, I wonder if some sort of exotic life could evolve inside the jet. Some sort of life that would be totally rare in the universe.
Has that work developed and found traction among physicists in the 7 years since the article?
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...
One could then quite reasonably argue that our universe is indeed inside or is itself a black hole.
An average black hole has 50 suns in it, 50 times the mass of our star, that would be a universe without much matter.
>is mass 1-to-1 with the "parent" universe? In this theory, are we inside a black hole containing billions of galaxies worth of matter?
My understanding of the theory is that the proposed parent black hole which our universe is inside would necessarily have to contain all of the mass that we detect in our observable universe. So our universe would be 1-to-1 mass of the parent black hole. The parent universe would be larger (and may contain many black holes, each with a nested universe).
>An average black hole has 50 suns in it, 50 times the mass of our star, that would be a universe without much matter
Indeed! It's interesting to think that perhaps we are on one of the "lowest" layers of the nested multiverse, and perhaps there are only a few dozen (or whatever) layers below us until there is too little mass in that universe to create any more black holes. However, there could be an infinite amount of layers "above" us.
I am curious to where the 50 solar-mass figure comes from, though. Is this excluding super-massive and ultra-massive black holes (which are on the order of 10^6 to 10^11 solar masses)? My intuition says 50 solar-masses is orders of magnitude too low for the average mass of a black hole, but I've never really looked into it
Some might say humans are exotic life that evolved.