Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A two particle hidden sector and the oscillations with photons   We present a detailed study of the oscillations and optical properties for
vacuum, in a model for the dark sector that contains axion-like particles and
hidden photons. In this model, both can couple to photons. We provide bounds
for the couplings versus the mass, using current results from ALPS-I and PVLAS.
We also discuss the challenges for the detection of models with more than one
hidden particle in light shining trough wall-like experiments.

25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
19
The categories of this paper are: eess