Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal vortex dynamics in a two-dimensional condensate   We carry out an analytical and numerical study of the motion of an isolated
vortex in thermal equilibrium, the vortex being defined as the point
singularity of a complex scalar field $\psi(\r,t)$ obeying a nonlinear
stochastic Schr\"odinger equation. Because hydrodynamic fluctuations are
included in this description, the dynamical picture of the vortex emerges as
that of both a massive particle in contact with a heat bath, and as a passive
scalar advected to a background random flow. We show that the vortex does not
execute a simple random walk and that the probability distribution of vortex
flights has non-Gaussian (exponential) tails.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
18
The categories of this paper are: econ