Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Second sound spectroscopy of a nonequilibrium superfluid-normal
  interface   An experiment is proposed to test a previously developed theory of the
hydrodynamics of a nonequilibrium heat current-induced superfluid-normal
interface. It is shown that the interfacial ``trapped'' second sound mode
predicted by the theory leads to a sharp resonant dip in the reflected signal
from an external second sound pulse propagated towards the interface when its
horizontal phase speed matches that of the interface mode. The influence of the
interface on thermal fluctuations in the bulk superfluid is shown to lead to
slow power dependence of the order parameter, and other quantities, on distance
from it.

27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat