According to general relativity, the initial state of the universe, at the beginning of the Big Bang, was a singularity (with infinite density and zero volume). Both general relativity and quantum mechanics break down in describing the Big Bang. Despite its successes, the standard big bang theory was too simple to be complete. The Inflation Theory proposes a period of extremely rapid (exponential) expansion of the universe during its first few moments. It was developed around 1980 to explain several puzzles with the standard Big Bang theory, in which the universe expands relatively gradually throughout its history. So, we should review the Friedmann equation should, the inflationary and Big Bang theory.

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