Because of the Big Bang, universe space is expanding uniformly and linearly {space expansion} {expansion, inflation}. For example, twice as far away, space expands twice as fast. Far enough away, space can expand faster than light.
relativity
Spatial expansion is about space itself expanding. Spatial expansion is not movement through space, so relativity does not apply.
effects on objects
Space expansion is less strong than electromagnetic and nuclear forces, so objects only stretch slightly. Space expansion is less strong than gravity, except between galaxies.
universe inflation
Universe began with low entropy. Before cosmic inflation, universe had little mass-energy, only 10 kilograms in 10^-28 meter diameter sphere, or 10^-8 kilograms in 10^-35 meter diameter sphere if minimum entropy. Only one trapped inflaton can start inflation. Cosmic inflation expanded space faster than light. During cosmic inflation, inflaton field gained potential energy, because space expansion reduces kinetic energy and increases potential energy. Energy density was constant, because energy grew equally with volume.
Perhaps, there are many inflated universes.
Physical Sciences>Physics>Relativity>General Relativity
5-Physics-Relativity-General Relativity
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Date Modified: 2022.0224