Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Einstein-Maxwell-aether-axion theory: Dynamo-optical anomaly in the
  electromagnetic response   We consider a pp-wave symmetric model in the framework of the
Einstein-Maxwell-aether-axion theory. Exact solutions to the equations of axion
electrodynamics are obtained for the model, in which pseudoscalar, electric and
magnetic fields were constant before the arrival of a gravitational pp-wave. We
show that dynamo-optical interactions, i.e. couplings of the electromagnetic
field to a dynamic unit vector field, attributed to the velocity of a cosmic
substratum (aether, vacuum, dark fluid...), provide the response of axionically
active electrodynamic system to display anomalous behavior.

12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn