Theory 50/Deep Time/Cosmology
Structure Is Collapse Against Expansion
The claim
The largest bound structures are set by the ratio of gravitational collapse time to the age of the universe, so structures larger than a threshold have not had time to form.
01Mechanism
Collapse requires a region to be overdense enough to decouple from expansion; the ratio of collapse time to cosmic age determines which scales can virialise.
02Prediction
Maximum bound scale should track the ratio.
03Refutation
Structure tracking initial overdensity alone would remove expansion.