What were the transformations that the universe underwent before the matter era happened?
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about 13.8 billion years ago
Fundamental mysteries
According to the standard Big Bang model, the universe was born during a period of inflation that began about 13.8 billion years ago. Like a rapidly expanding balloon, it swelled from a size smaller than an electron to nearly its current size within a tiny fraction of a second.
In the Big Bang theory, the era that started when the gravitational effect of matter began to dominate the effect of radiation pressure. ... Matter is thought to have become predominant at a temperature of around 104K, roughly 30 000 years after the Big Bang. This marked the start of the matter era. See also Radiation era.
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