Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse Spin Diffusion in a Dilute Spin-Polarized Degenerate Fermi
  Gas   We re-examine the calculation of the transverse spin-diffusion coefficient in
a dilute degenerate spin-polarized Fermi gas, for the case of s-wave
scattering. The special feature of this limit is that the dependence of the
spin diffusion coefficient on temperature and field can be calculated
explicitly with no further approximations. This exact solution uncovers a novel
intermediate behavior between the high field spin-rotation dominated regime in
which $D_{\bot} \propto H^{-2}$, $D_{\parallel} \propto T^{-2}$, and the
low-field isotropic, collision dominated regime with $D_{\bot} = D_{\parallel}
\propto T^{-2}$. In this intermediate regime, $D_{\bot ,\parallel} \propto
T^{-2}$ but $D_{\bot} \neq D_{\parallel}$. We also present an analytical
calculation of the self-energy in the s-wave approximation for a dilute
spin-polarized Fermi gas, at zero temperature. This emphasizes the failure of
the conventional Fermi-liquid phase space arguments for processes involving
spin flips. We close by reviewing the evidence for the existence of the
intermediate regime in experiments on weakly spin-polarized $^3{\rm He}$ and
$^3{\rm He} - ^4{\rm He}$ mixtures.

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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph