Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-temperature limit of the resonant Fermi gas   We use the virial expansion to investigate the behavior of the two-component,
attractive Fermi gas in the high-temperature limit, where the system smoothly
evolves from weakly attractive fermions to weakly repulsive bosonic dimers as
the short-range attraction is increased. We present a new formalism for
computing the virial coefficients that employs a diagrammatic approach to the
grand potential and allows one to easily include an effective range $R^*$ in
the interaction. In the limit where the thermal wavelength $\lambda \ll R^*$,
the calculation of the virial coefficients is perturbative even at unitarity
and the system resembles a weakly interacting Bose-Fermi mixture for all
scattering lengths $a$. By interpolating from the perturbative limits
$\lambda/|a| \gg 1$ and $R^*/\lambda \gg 1$, we estimate the value of the
fourth virial coefficient at unitarity for $R^*=0$ and we find that it is close
to the value obtained in recent experiments. We also derive the equations of
state for the pressure, density and entropy, as well as the spectral function
at high temperatures.

33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
2
The categories of this paper are: math
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
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The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an