When calculations showed that general-relativity equations require that universe expand forever, Einstein introduced extra space-time force {cosmological constant}|, whose attractive force balanced space expansion and maintained static and infinite universe. However, recent observations show that, though gravity slows expansion, space expansion is accelerating, requiring repulsive cosmological constant. Perhaps, dark energy or quintessence supplies cosmological constant. Perhaps, universe angular momentum causes cosmological constant (but universe does not rotate).
Physical Sciences>Astronomy>Universe>Cosmology>Energy
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Date Modified: 2022.0224