Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density-functional model for van der Waals interactions: Unifying
  many-body atomic approaches with nonlocal functionals   Noncovalent van der Waals (vdW) interactions are responsible for a wide range
of phenomena in matter. Popular density-functional methods that treat vdW
interactions use disparate physical models for these intricate forces, and as a
result the applicability of these methods is often restricted to a subset of
relevant molecules and materials. Aiming towards a general-purpose density
functional model of vdW interactions, here we unify two complementary
approaches: nonlocal vdW functionals for polarization and interatomic methods
for many-body interactions. The developed nonlocal many-body dispersion method
(MBD-NL) increases the accuracy and efficiency of existing vdW functionals and
is shown to be broadly applicable to molecules, soft and hard materials
including ionic and metallic compounds, as well as organic/inorganic
interfaces.

33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex