Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Consequences of vacuum polarization on electromagnetic waves in a
  Lorentz-symmetry breaking scenario   The propagation of electromagnetic waves in a Lorentz-symmetry violating
scenario where there is a region of polarized vacuum is studied. It turns out
that the photon field acquires an interesting polarization state, possibly
useful to set up upper bounds in Lorentz-violating models at laboratory scales.

12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph