Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Does the spin tensor play any role in non-gravitational physics?   In view of the recent polarization measurements in ultra-relativistic heavy
ion collisions, we discuss the possibility of a physical meaning of the spin
angular momentum in quantum field theory and relativistic hydrodynamics.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph