When we talk about the inflation and other cosmological topics, we calculate the scalar dynamics in the early universe. But how do fermions behave? In principle they should carry same amount of energy and they can effect the evolution of scalars via interactions. Why we just ignore them? Is there a scenario where fermions in the early universe are important?(adsbygoogle = window.adsbygoogle || []).push({});

thx

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# Why always scalars?

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