Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large scale structure in the intergalactic magnetic field and ultra-high
  energy cosmic ray propagation   The possibility that the magnetic field is strongly correlated with the
large-scale structure of the universe has been recently proposed in the
literature. In this scenario the intergalactic magnetic field has a strong (m
Gauss) regular component spanning tens of Mpc. This could have severe
consequences on the propagation of ultra-high energy cosmic rays, and the
observed spectra, isotropy and composition. A quantitative discussion of these
effects is given in the present work.

26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph