Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lower bound on the magnetic field strength in the hot universe   It is assumed that long range coherent magnetic fields in the universe were
spontaneously generated at high temperature due to vacuum polarization of
non-Abelian gauge fields, and resulted in the present intergalaxy magnetic
field. The zero value of the screening mass for fields of this type was
discovered recently. Here, a procedure to estimate the field strengths at
different temperatures is developed and the lower bound on the magnetic field
strength $B \sim 10^{14} G$, at the electroweak phase transition temperature,
is derived. As a particular case, the standard model is considered. Some model
dependent peculiarities of the phenomena under investigation are briefly
discussed.

1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph