Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supersonic and subsonic shock waves in the unitary Fermi gas   We investigate shock waves in the unitary Fermi gas by using the
zero-temperature equations of superfluid hydrodynamics. We obtain analytical
solutions for the dynamics of a localized perturbation of the uniform gas.
These supersonic bright and subsonic dark solutions produce, after a transient
time, an extremely large (divergent) density gradient: the shock. We calculate
the time of formation of the shock and also simulate the space-time behavior of
the waves by solving generalized hydrodynamic equations, which include a
reliable dispersive regularization of the shock. We find that the shock spreads
into wave ripples whose properties crucially depend on the chosen initial
configuration.

36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph