Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear interaction between electromagnetic and gravitational waves:
  an appraisal   Wave propagation of field disturbances is ubiquitous. The electromagnetic and
gravitational are cousin theories in which the corresponding waves play a
relevant role to understand several related physical. It has been established
that small electromagnetic waves can generate gravitational waves and vice
versa when scattered by a charged black hole. In the realm of cylindrical
spacetimes, we present here a simple nonlinear effect of the conversion of
electromagnetic to gravitational waves reflected by the amount of mass
extracted from them.

10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex