Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Einstein-Cartan Theory   The Einstein--Cartan Theory (ECT) of gravity is a modification of General
Relativity Theory (GRT), allowing space-time to have torsion, in addition to
curvature, and relating torsion to the density of intrinsic angular momentum.
This modification was put forward in 1922 by Elie Cartan, before the discovery
of spin. Cartan was influenced by the work of the Cosserat brothers (1909), who
considered besides an (asymmetric) force stress tensor also a moments stress
tensor in a suitably generalized continuous medium.

4
The categories of this paper are: cond-mat
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
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an