Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stress-induced ordering of two-dimensional packings of elastic spheres   Packing of particles in confined environments is a common problem in multiple
fields. Here, based on the two-dimensional Hertzian particle model, we study
the packing of deformable spherical particles under compression, and reveal the
crucial role of stress as an ordering field in regulating particle arrangement.
  Specifically, under increasing compression, the squeezed particles
spontaneously organize into regular packings in the sequence of triangular and
square lattices, pentagonal tessellation, and the reentrant triangular lattice.
The rich ordered patterns and complex structures revealed in this work suggest
a fruitful organizational strategy based on the interplay of external stress
and intrinsic elastic instability of particle arrays.

7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
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The categories of this paper are: eess
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics