Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on Very Light Axions from Cavity Experiments   In view of the ongoing galactic (or cosmic) axion detection experiments, we
compare the axion-photon-photon coupling $c_{a\gamma\gamma}$'s for various
invisible (or very light) axion models.

11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ