5.( In the very early stages of the Universe, it is usually a good approxima- tion to neglect particle masses and chenical potentials compared to kgT. Write down formulae for the number densities and energy densities of non- interacting fermions under these conditions.
5.( In the very early stages of the Universe, it is usually a good approxima- tion to neglect particle masses and chenical potentials compared to kgT. Write down formulae for the number densities and energy densities of non- interacting fermions under these conditions.
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Transcribed Image Text:15. In the very early stages of the Universe, it is usually a good approxima-
tion to neglect particle masses and chenical potentials compared to kgr.
Write down formulae for the number densities and energy densities of non-
interacting fermions under these conditions.
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