Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective Motion of Polarized Dipolar Fermi Gases in the Hydrodynamic
  Regime   Recently, a seminal STIRAP experiment allowed the creation of 40K-87Rb
molecules in the rovibrational ground state [K.-K. Ni et al., Science 322, 231
(2008)]. In order to describe such a polarized dipolar Fermi gas in the
hydrodynamic regime, we work out a variational time-dependent Hartree-Fock
approach. With this we calculate dynamical properties of such a system as, for
instance, the frequencies of the low-lying excitations and the time-of-flight
expansion. We find that the dipole-dipole interaction induces anisotropic
breathing oscillations in momentum space. In addition, after release from the
trap, the momentum distribution becomes asymptotically isotropic, while the
particle density becomes anisotropic.

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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: supr-con
21
The categories of this paper are: adap-org