Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Brane and string field structure of elementary particles   The two quantizations of QFT,as well as the attempt of unifying it with
general relativity,lead us to consider that the internal structure of an
elementary fermion must be twofold and composed of three embedded internal
(bi)structures which are vacuum and mass (physical) bosonic fields decomposing
into packets of pairs of strings behaving like harmonic oscillators
characterized by integers mu corresponding to normal modes at mu (algebraic)
quanta.

26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci