Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gapless kinetic theory beyond the Popov approximation   We present a unified kinetic theory that describes the finite-temperature,
non-equilibrium dynamics of a Bose-Einstein condensed gas interacting with a
thermal cloud. This theory includes binary interactions to second order in the
interaction potential and reduces to a diagonal quantum Boltzmann equation for
Bogoliubov quasiparticles. The Hartree-Fock-Bogoliubov interactions include the
pairing field and are expressed as many-body $T$ matrices to second order. The
interactions thus include the correct renormalized scattering physics. This
renormalized theory is automatically gapless. Thus, the excited Bogoliubov
modes are naturally orthogonal to the condensate ground state.

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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: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph