Electrical conductivity in the early universe

Abstract

We solve numerically the Boltzmann equation in the early universe in the presence of a constant electric field and find the electrical conductivity $\sigma$ in the range $1\text{MeV}\text{lsim}T\text{lsim}{M}_W$. The main contribution to $\sigma$ is shown to be due to leptonic interactions. For $T\text{lsim}100\text{MeV}$ we find $\sigma \simeq 0.76T$ while at $T\simeq M_W$ we obtain $\sigma \simeq 6.7T$

Comments: 7 pages in LaTeX