Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Moving vortex in relativistic irrotational perfect fluid or superfluid   Irrotational relativistic vortex configurations in uniform subsonic motion
with respect to a surrounding perfect fluid are analysed for the purpose of
application to superfluid layers in neutron stars. Asymptotic solutions are
found by asymptotically expanding the flow equation at large distances from the
vortex core and then by solving it order by order. The asymptotic effective
tension and energy density that are needed for an averaged macroscopic
description are thus obtained as functions of the vortex velocity, the vortex
circulation, the asymptotic chemical potential and of parameters depending on
the equation of state.

18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg