Well Erad is basically a result of the temperature. And yes I d assume the radiation to be that of a black body. And well the point of my question was that i have a hard time understanding the meaning of temperature in this context as well.
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Well this is just a formula to calculate the kinetic energy in a gas at a certain temperature. They are related in this context alone.
Right. Energy there means <E> average kinetic energy of the molecules, whereas when we talk about energy in QFT we're talking about the CM energy of a scattering process
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CM energy?
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center of mass
End of conversation
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