Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phyllotactic description of hard sphere packing in cylindrical channels   We develop a simple analytical theory that relates dense sphere packings in a
cylinder to corresponding disk packings on its surface. It applies for ratios
R=D/d (where d and D are the diameters of the hard spheres and the bounding
cylinder, respectively) up to R=1+1/sin(pi/5). Within this range the densest
packings are such that all spheres are in contact with the cylindrical
boundary. The detailed results elucidate extensive numerical simulations by
ourselves and others by identifying the nature of all competing phases.

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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th