Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillations of Spherical and Cylindrical Shells   We have found the complete spectrum and eigenstates for harmonic oscillations
of ideal spherical and cylindrical shells, both being infinitely thin. The
spectrum of the cylindrical shell has an infinite number of Goldstone modes
corresponding to folding deformations. This infrared catostrophe is overcome by
accounting for curvature-part of energy.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con