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This is really interesting. I actually did my thesis on BAOs but that’s almost a decade ago now and i haven’t been keeping up to date on the field so the whole “cosmologically coupled BHs” thing was new to me.
For those who, like me, are struggling a bit to understand what exactly they are talking about in this paper, here’s a couple of articles explaining these concepts in terms easier to understand for the lay person:
https://news.umich.edu/evidence-mounts-for-dark-energy-from-black-holes/
Ran across this today and reminded me of a discussion we had earlier. :)