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Radiation fills the Universe

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TIME: between 10-12 and 10-10 seconds

. This is where the Big Bang officially begins. Somehow at the end of the inflationary era, the Universe was left in a small, hot, dense quantum state. The so-called vacuum energy of the quantum fields changes into a seething soup of photons, gluons and other elementary particles. In the Einstein equations of general relativity, the expansion of the Universe can be driven by energy density in the form of matter and radiation. During the first phase of the Big bang, the radiation part of the energy density is so much bigger than the matter part of the energy density that we can forget matter exists, at least for a while.

How old is the Universe? // Structure of the Universe // The Big Bang // Before the Big Bang? // What about string theory?

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