The electrical conductivity has been calculated~1 in the early universe at temperatures below as well as above the electroweak vacuum scale, T_c approx= 100GeV. Debye and dynamical screening of electric and magnetic interactions leads to a finite conductivity, #sigma#_el approx T/#alpha#ln(1/#alpha#), at temperatures well beelow T_c. At temperatures above, W~+- charge-exchange processes - analogous to color exchange through gluons in QCD- effectively sstop left-handed charged leptons. However, right-handed leptons can carry current, resulting in #sigma#_el/T being only a factor approx cos~4#theta#_W smaller than at temperatures below T_c.
展开▼
