The universe is a 4 dimensional sphere, so everything could be moving away without increasing 3 dimensional space. Eventually in trillion or quadrillions of years everything would start to blue shift as things move towards us on the other side of the sphere.
So how do I travel backwards in the 4th dimension? Or conversely, where's the source of the force that propels us through the 4th dimension?
I'll leave this comment here since I'm about to get rate limited: I read/heard a great idea recently, what if gravity is an emergent quantity like heat? Maybe dense fermions just radiate gravitons just like a hot mass radiates photons?
> I read/heard a great idea recently, what if gravity is an emergent quantity like heat? Maybe dense fermions just radiate gravitons just like a hot mass radiates photons?
Gravity is the result of spacetime curvature, if I remember correctly.
In that case, wouldn't it have to be more complex than just a particle which creates gravity? Something which is compatible with the finding of spacetime curvature?
