Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonsequential double ionization with time-dependent
  renormalized-natural-orbital theory   Recently introduced time-dependent renormalized natural orbital theory
(TDRNOT) is tested on non-sequential double ionization (NSDI) of a numerically
exactly solvable one-dimensional model He atom subject to few-cycle, 800-nm
laser pulses. NSDI of atoms in strong laser fields is a prime example of
non-perturbative, highly correlated electron dynamics. As such, NSDI is an
important "worst-case" benchmark for any time-dependent few and many-body
technique beyond linear response. It is found that TDRNOT reproduces the
celebrated NSDI "knee," i.e., a many-order-of-magnitude enhancement of the
double ionization yield (as compared to purely sequential ionization) with only
the ten most significant natural orbitals (NOs) per spin. Correlated
photoelectron spectra - as "more differential" observables - require more NOs.

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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th