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If enough mass crosses the Hubble sphere, leaving a critically low mass behind, will there be a gravitational catastrophe? That is will the balance of all the interacting gravitational fields be so disturbed that there will be a catastrophic change.

Quote from: jeffreyH on 10/03/2015 23:05:15If enough mass crosses the Hubble sphere, leaving a critically low mass behind, will there be a gravitational catastrophe? That is will the balance of all the interacting gravitational fields be so disturbed that there will be a catastrophic change.What do you mean?If there is a sizable inhomogeneity in a spacetime region, then, yes, there will not be the expansion (or other gravitation phenomena) there that one expects from a homogeneous spacetime. This is why we see galaxies and solar systems.Because of the action of a cosmological constant, mass can continue to leave any given horizons, but do so in an isotropic fashion. That means that there could be less and less gravity to create a "drag" on expansion for any given region.