Relativity and Cosmology

    

The Extremely Slow Expansion in the Early Universe

Authors: Zhengxi Wang

300,000 years after the Big Bang, the first atoms formed. Subsequently, matter began to clump together, giving rise to stars and galaxies. As matter accumulated, its mass increased while its motion velocity decreased significantly. Simultaneously, under the influence of gravity, the expansion rate of the universe was substantially reduced, leading to a period of extremely slow expansion. During this period, stars and galaxies developed, grew, and matured. Subsequently, as temperatures continued to drop, dark energy came into play, and the universe entered a phase of slow expansion, gradually accelerating to reach the Hubble velocity.

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[v1] 2025-02-01 21:16:00

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