Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Separation and Coarsening in Electrostatically Driven Granular
  Media   A continuum model for the phase separation and coarsening, observed in
electrostatically driven granular media, is formulated in terms of a
Ginzburg-Landau equation subject to conservation of the total number of grains.
In the regime of well-developed clusters, the continuum model is used to derive
"sharp-interface" equations that govern the dynamics of the interphase
boundary. The model captures the essential physics of this system.

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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: q-fin
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas