Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical velocity of antiferromagnetic spin-1 Bose-Einstein condensates
  at finite temperature   We study the instability of a moving spinor Bose-Einstein condensate when the
speed of flow reaches the critical velocity. This we identify on the basis of
Landau's criterion, i.e. the velocity above which some elementary excitation
energy becomes negative. We show that the first-to-become unstable excitations
are spin-carrying quasiparticles. We also discuss the temperature dependence of
the critical velocity in a more advanced mean-field approximation.

36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math