Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vibrational and acoustical properties of a liquid drop in the
  phase-separated fluid with a highly mobile interface   We study the oscillation spectrum and acoustic properties of a liquid drop in
the phase-separated fluid when the interfacial dynamics of phase conversion can
be described in terms of the kinetic growth coefficient. For a readily mobile
interface, i.e., as the growth coefficient becomes comparable with a reciprocal
of the acoustic impedance, anomalous behavior is found in the oscillation
spectrum of a drop as well as in the velocity and absorption of a sound wave
propagating through a suspension of drops in the two-phase system. Compared
with the known case of two immiscible fluids, the high interface mobility leads
to an anomalous softening of the radial drop pulsations and to the frequency-
and temperature-dependent behavior for the sound velocity and absorption
coefficient in a two-phase suspension.

31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex