Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The shadow of light: evidences of photon behaviour contradicting known
  electrodynamics   We report the results of a double-slit-like experiment in the infrared range,
which evidence an anomalous behaviour of photon systems under particular
(energy and space) constraints. The statistical analysis of these outcomes
(independently confirmed by crossing photon beam experiments in both the
optical and the microwave range) shows a significant departure from the
predictions of both classical and quantum electrodynamics.

35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg