Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Friction Domination with Superconducting Strings   We investigate the evolution of a superconducting string network with
arbitrary, constant string current in the friction dominated regime. In the
absence of an external magnetic field the network always reaches a scaling
solution. However, for string current stronger than a critical value, it is
different than the usual, horizon-scaling of the non-superconducting string
case. In this case the friction domination era never ends. Whilst the
superconducting string network can be much denser than usually assumed, it can
never dominate the universe energy density. It can, however, influence the
cosmic microwave background radiation and the formation of large scale
structure. When embedded in a primordial magnetic field of sufficient strength,
the network never reaches scaling and, thus, eventually dominates the universe
evolution.

1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol