Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrical Conduction in the Early Universe   The electrical conductivity has been calculated in the early universe at
temperatures below as well as above the electroweak vacuum scale, $T_c\simeq
100$GeV. Debye and dynamical screening of electric and magnetic interactions
leads to a finite conductivity, $\sigma_{el}\sim T/\alpha\ln(1/\alpha)$, at
temperatures well below $T_c$. At temperatures above, $W^\pm$ charge-exchange
processes -- analogous to color exchange through gluons in QCD -- effectively
stop left-handed charged leptons. However, right-handed leptons can carry
current, resulting in $\sigma_{el}/T$ being only a factor $\sim \cos^4\theta_W$
smaller than at temperatures below $T_c$.

36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph