Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Are neutral Goldstone bosons initiating very energetic air showers and
  anomalous multiple-core structure as a component of cosmic rays?   We consider two recently accentuated, unusual empirical results concerning
cosmic-ray events at high energies. We show that the possibility for a
correlated explanation is provided by new dynamics which arises from collisions
of a neutral Goldstone boson as a component of the highest-energy cosmic rays.

14
The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph