Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the notion of the photon   It is shown that the photon, the quantum of electromagnetic field, allows the
consideration in the framework of the scheme which in some aspects is typical
for the phonon, an excitation of the crystal lattice of a solid. The conclusion
is drawn that the photon may be interpreted as an elementary excitation in a
fine-grained space. The corollary is in excellent agreement with the space
structure and submicroscopic quantum mechanics, which have recently been
constructed by the author in a series of works.

3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat