Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical Friction in Nonlocal Gravity   We study dynamical friction in the Newtonian regime of nonlocal gravity
(NLG), which is a classical nonlocal generalization of Einstein's theory of
gravitation. The nonlocal aspect of NLG simulates dark matter. The attributes
of the resulting effective dark matter are described and the main physical
predictions of nonlocal gravity, which has a characteristic lengthscale of
order 1 kpc, for galactic dynamics are presented. Within the framework of NLG,
we derive the analogue of Chandrasekhar's formula for dynamical friction. The
astrophysical implications of the results for the apparent rotation of a
central bar subject to dynamical friction in a barred spiral galaxy are briefly
discussed.

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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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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: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int