Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Least-Order Torsion-Gravity for Dirac Fields, and their Non-Linearity
  terms   We will consider the most general least-order torsional completion of gravity
with electrodynamics for the Dirac matter fields, and we study the effects that
the torsion-spin coupling will have in inducing self-interactions among the
fermion fields themselves; we will see that such self-interactions of fermions
have effects analogous to those of the field-quantization prescription, and we
will study the way in which they can give rise to matter distributions that are
localized in a compact region and stable under the influence of perturbations.

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The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
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The categories of this paper are: econ
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph