Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconducting Radio Frequency Cavities as Axion Dark Matter Detectors   A modification of the cavity technique for axion dark matter detection is
described in which the cavity is driven with input power instead of being
permeated by a static magnetic field. A small fraction of the input power is
pumped by the axion field to a receiving mode of frequency $\omega_1$ when the
resonance condition $\omega_1 = \omega_0 \pm m_a$ is satisfied, where
$\omega_0$ is the frequency of the input mode and $m_a$ the axion mass. The
relevant form factor is calculated for any pair of input and output modes in a
cylindrical cavity. The overall search strategy is discussed and the technical
challenges to be overcome by an actual experiment are listed.

5
The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas