Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interaction beween polarons and analogous effects in polarized Fermi
  gases   We consider an imbalanced mixture of two different ultracold Fermi gases,
which are strongly interacting. Calling spin-down the minority component and
spin-up the majority component, the limit of small relative density $x=n\ds
/n\us$ is usually considered as a gas of non interacting polarons. This allows
to calculate, in the expansion of the total energy of the system in powers of
$x$, the terms proportional to $x$ (corresponding to the binding energy of the
polaron) and to $x^{5/3}$ (corresponding to the kinetic energy of the polaron
Fermi sea). We investigate in this paper terms physically due to an interaction
between polarons and which are proportional to $x^2$ and $x^{7/3}$. We find
three such terms. A first one corresponds to the overlap between the clouds
dressing two polarons. The two other ones are due to the modification of the
single polaron binding energy caused by the non-zero density of polarons. The
second term is due to the restriction of the polaron momentum by the Fermi sea
formed by the other polarons. The last one results from the modification of the
spin-up Fermi sea brought by the other polarons. The calculation of all these
terms is made at the simplest level of a single particle-hole excitation. It is
performed for all the possible interaction strengths within the stability range
of the polaron. At unitarity the last two terms give a fairly weak contribution
while the first one is strong and leads to a marked disagreement with
Monte-Carlo results. The possible origins of this discrepancy are discussed.

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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
2
The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio