Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Study of Dust Acoustic Waves in the Strongly Correlated
  Regime   Low frequency dust acoustic waves (DAW) were excited in a laboratory argon
dusty plasma by modulating the discharge voltage with a low frequency AC
signal. Metallic graphite particles were used as dust grains and a digital FFT
technique was used to obtain dispersion characteristics. The experimental
dispersion relation shows the reduction of phase velocity and a regime where
$\partial \omega/\partial k < 0$. A comparison is made with existing
theoretical model.

37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph