Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superfluid hydrodynamics of polytropic gases:dimensional reduction and
  sound velocity   Motivated by the fact that two-component confined fermionic gases in
Bardeen-Cooper-Schrieffer-Bose-Einstein condensate (BCS-BEC) crossover can be
described through an hydrodynamical approach, we study these systems - both in
the cigar-shaped configuration and in the disk-shaped one - by using a
polytropic Lagrangian density. We start from the Popov Lagrangian density and
obtain, after a dimensional reduction process, the equations that control the
dynamics of such systems. By solving these equations we study the sound
velocity as a function of the density by analyzing how the dimensionality
affects this velocity

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The categories of this paper are: eess
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc