Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Superstrings and Primordial Magnetogenesis   Cosmic superstrings are produced at the end of brane inflation. Their
properties are similar to cosmic strings arising in grand unified theories.
Like cosmic strings they can give rise to a primordial magnetic field, as a
result of vortical motions stirred in the ionised plasma by the gravitational
pull of moving string segments. The resulting magnetic field is both strong
enough and coherent enough to seed the galactic dynamo and explain the observed
magnetic fields of the galaxies.

21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom