Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Colloids in Cholesterics: Size-Dependent Defects and Non-Stokesian
  Microrheology   We simulate a colloidal particle (radius R) in a cholesteric liquid crystal
(pitch p) with tangential order parameter alignment at the particle surface.
The local defect structure evolves from a dipolar pair of surface defects
(boojums) at small R/p to a pair of twisted disclination lines wrapping around
the particle at larger values. On dragging the colloid with small velocity v
through the medium along the cholesteric helix axis (an active microrheology
measurement), we find a hydrodynamic drag force that scales linearly with v but
superlinearly with R-in striking violation of Stokes' law, as generally used to
interpret such measurements.

1
The categories of this paper are: cs
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
22
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
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex