Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing exotic neutrino-neutrino interactions with AGN neutrinos   We propose a test for non-standard neutrino-neutrino interactions by using
ultrahigh energy AGN neutrinos. Such interactions would influence the AGN
neutrino flux due to collisions with cosmic background neutrinos. For typical
AGN neutrinos we obtain an upper limit for the coupling constant $g<6.4\cdot
10^{-3}$ if the mediator is light and $g/(M_X/MeV) <0.013$ if the mediator is
heavy. We compare our results with constraints from other phenomena previously
considered.

15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ