Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermi gas throughout the BCS-BEC crossover: Comparative study of
  t-matrix approaches with various degrees of self-consistency   The diagrammatic t-matrix approximation has often been adopted to describe a
dilute Fermi gas. This approximation, originally considered by Galitskii for a
repulsive inter-particle interaction (Galitskii-1958), has later been widely
utilized for an attractive Fermi gas to describe the BCS-BEC crossover from
strongly overlapping Cooper pairs in weak coupling to non-overlapping composite
bosons in strong coupling. Several variants of the $t$-matrix approximation
have been considered in the literature, which are distinguished by the degree
of self-consistency allowed in the building blocks of the diagrammatic
structure. Here, we perform a systematic and comparative study of all possible
variants on the degree of self-consistency for the $t$-matrix approximation in
an attractive Fermi gas, which enables us to confront their outcomes for
thermodynamic and dynamical quantities on the same footing in an unbiased way.
For definiteness, only the normal phase above the superfluid critical
temperature is considered. The dispute that can be raised in this context,
about the adequateness of introducing progressive degrees of self-consistency
over and above the non-self-consistent $t$-matrix approximation for an
attractive Fermi gas, parallels the recent interest in the literature on
assessing the importance of various degrees of self-consistency in the context
of semiconductors and insulators.

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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: patt-sol