Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino production in UHECR proton interactions in the infrared
  background   We discuss the contribution of proton photoproduction interactions on the
isotropic infrared/optical background to the cosmic neutrino fluxes. This
contribution has a strong dependence on the proton injection energy spectrum,
and is essential at high redshifts.
  It is thus closely correlated with the cosmological evolution of the ultra
high energy proton sources and of the inrared background itself. These
interactions may also contribute to the source fluxes of neutrinos if the
proton sources are located in regious of high infrared emission and magnetic
fields.

27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol