Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the torsion effects of a relativistic spin fluid in early cosmology   In this work we investigate the effects of torsion in the framework of
Einstein-Cartan theory in early cosmology. We study solutions for a homogeneous
and isotropic relativistic Weyssenhoff spin fluid with dynamical timelike axial
current, also homogeneous and isotropic. The general solutions can mostly be
described by means of three particular solutions. The properties of these
solutions (such as singularity avoidance and primordial or late accelerated
expansion) are analysed and depend on the relations between the source
parameters.

3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga