Cosmology and the Origin of Life


Important Simplification in the Early Universe: Thermal Equilibrium:

MATH ALERT!!

Unfortunately we now have to do this:

When the radiation energy density exceeds the matter density the universe is said to be RADIATION DOMINATED

When the matter energy density exceeds the radiation density the universe is said to be MATTER DOMINATED

As we will see later, when the universe is radiation dominated gravity is effectively unimportant (or at least its effects are greatly diminished)

MOST IMPORTANT POINT:

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