Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From spinning to non-spinning cosmic string spacetimes   We analyse the properties of a fluid generating a spinning cosmic string
spacetime with flat limiting cases corresponding to a constant angular momentum
in the infinite past and static configuration in the infinite future. The
spontaneous loss of angular momentum of a spinning cosmic string due to
particle emission is discussed. The rate of particle production between the
spinning and non-spinning cosmic string spacetimes is calculated.

4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex