Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flow of hypermagnetic helicity in the embryo of a new phase in the
  electroweak phase transition   The dynamics of the magnetic helicity during the electroweak phase transition
in the early Universe is studied. It is shown that the boundary surface between
symmetric (hypermagnetic) phase and Maxwellian phase with a broken symmetry is
a membrana for the separation of the magnetic helicity. Assuming the total
linking number of knots of hypermagnetic field is negative, it is proved that
the helicity rising in the Maxwellian phase is left-handed.

17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs