Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Implications for the Cosmic Ray Spectrum of a Negative Electron Neutrino
  Mass^2   The features and problems of a speculative model based on the electron
neutrino being a tachyon are discussed. The model is consistent with five
properties of the cosmic ray spectrum, and it predicts a flux of neutrons in a
narrow energy region centered on 4.5 +/- 2.2 x 10^{15} eV.

15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci