Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parametric internal waves in a compressible fluid   We describe the effect of vibration on a confined volume of fluid which is
density stratified due to its compressibility. We show that internal
gravity-acoustic waves can be parametrically destabilized by the vibration. The
resulting instability is similar to the classic Faraday instability of surface
waves, albeit modified by the compressible nature of the fluid. It may be
possible to observe experimentally near a gas-liquid critical point.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci