So I ever since i was interested in science the expansion of the universe didn't sit right with me, atleast the theories behind that of which i knew at the time.
And I haven't heard this one so i'll just see if this theory has either already been discussed, or could at all be plausable
The theory i'm basing this off is the gravitational waves one. If gravity indeed does move at the speed of light, then I'd go and say that the expansion of the 'universe' (well, the universe itself wouldn't be expanding if i'm correct) is simply how we perceive spacetime returning to it's natural state after being tugged on by the mass of the Big Bang's singularity. The increasing acceleration could maybe be explained by thinking of space time as a rubber band - once you release it will build up speed over time. The burst of energy of the big bang could've also released gravitational energy (??) which would in turn bend spacetime (????) which would give the impression of FTL expansion (?????)
So yeah, i have no math to back this up, no nothing, but in my mind this seems logical and i thought i'd share this with you
(criticism highly encouraged although "that's not at all how it works" is also appreciated )