Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum field theory of axion-photon mixing and vacuum polarization   We report on recent results obtained by analyzing axion--photon mixing in the
framework of quantum field theory. We obtain corrections to the oscillation
formulae and we reveal a new effect of the vacuum polarization due to the
non-zero value of the vacuum energy for the component of the photon
polarization mixed with the axion. The study of axion--photon mixing in curved
space is also presented. Numerical analysis show that some quantum field theory
effect of axion--photon mixing, in principle, could be detected experimentally.

2
The categories of this paper are: math
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas