Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fundamental interactions and quantum behaviour in unified field theory   The concept of unified field theory is discussed. Two nonlinear field models
with world volume type action are considered, namely extremal space-time film
model and Born -- Infeld nonlinear electrodynamics. The natural appearance of
two long-range fundamental interactions, electromagnetism and gravitation, in
these field models is discussed. The quantum behaviour of the interacting
solitons-particles is considered. The concept of quasi-bounding quantization in
nonlinear field models is introduced.

35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn