Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral moment sum rules for strongly correlated electrons in
  time-dependent electric fields   We derive exact operator average expressions for the first two spectral
moments of nonequilibrium Green's functions for the Falicov-Kimball model and
the Hubbard model in the presence of a spatially uniform, time-dependent
electric field. The moments are similar to the well-known moments in
equilibrium, but we extend those results to systems in arbitrary time-dependent
electric fields. Moment sum rules can be employed to estimate the accuracy of
numerical calculations; we compare our theoretical results to numerical
calculations for the nonequilibrium dynamical mean-field theory solution of the
Falicov-Kimball model at half-filling.

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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: q-bio