Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vortex excitation in a stirred toroidal Bose-Einstein condensate   Motivated by the recent experiment [Wright et al., Phys. Rev. A 88, 063633
(2013)], we investigate formation of vortices in an annular BEC stirred by a
narrow blue-detuned optical beam. In the framework of a two-dimensional mean
field model, we study the dissipative dynamics of the condensate with
parameters matched to the experimental conditions. Vortex-antivortex pairs
appear near the center of the stirrer in the bulk of the condensate for slow
motion of the stirring beam. When the barrier angular velocity is above some
critical value, an outer edge surface mode develops and breaks into the
vortices entering the condensate annulus. We determine the conditions for
creation of the vortex excitations in the stirred toroidal condensate and
compare our results with the experimental observations.

23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph