Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Computer simulation of topological defects around a colloidal particle
  or droplet dispersed in a nematic host   We use molecular dynamics to study the ordering of a nematic liquid crystal
around a spherical particle or droplet. Homeotropic boundary conditions and
strong anchoring create a hedgehog director configuration on the particle
surface and in its vicinity; this topological defect is cancelled by nearby
defect structures in the surrounding liquid crystal, so as to give a uniform
director field at large distances. We observe three defect structures for
different particle sizes: a quadrupolar one with a ring defect surrounding the
particle in the equatorial plane; a dipolar one with a satellite defect at the
north or south pole; and a transitional, non-equatorial, ring defect. These
observations are broadly consistent with the predictions of the simplest
elastic theory. By studying density and order-parameter maps, we are able to
examine behaviour near the particle surface, and in the disclination core
region, where the elastic theory is inapplicable. Despite the relatively small
scale of the inhomogeneities in our systems, the simple theory gives reasonably
accurate predictions of the variation of defect position with particle size.

22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an