Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dense granular flow at the critical state: maximum entropy and
  topological disorder   After extensive quasi-static shearing, dense dry granular flows attain a
steady-state condition of porosity and deviatoric stress, even as particles are
continually rearranged. The paper considers two-dimensional flow and derives
the probability distributions of two topological measures of particle
arrangement---coordination number and void valence---that maximize topological
entropy. By only considering topological dispersion, the method closely
predicts the distribution of void valences, as measured in discrete element
(DEM) simulations. Distributions of coordination number are also derived by
considering packings that are geometrically and kinetically consistent with the
particle sizes and friction coefficient. A cross-entropy principle results in a
distribution of coordination numbers that closely fits DEM simulations.

14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom