Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The photon and a preferred frame scenario   Structure of the space of photonic states is discussed in the context of a
working hypothesis of existence of a preferred frame for photons. Two
polarisation experiments are proposed to test the preferred frame scenario.

3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg