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Analytical expressions of the relativistic effective degrees of freedom$g_\ast$ with non-pure fermionic neutrinos are presented. A semi-analyticalstudy is performed to show that $g_\ast$ with pure fermionic neutrinos may begreater than $g_\ast$ with pure bosonic neutrinos for non-vanishing leptonflavor asymmetries.

Relativistic effective degrees of freedom and quantum statistics of neutrinos