Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Introduction to colloidal dispersions in external fields   Progress in the research area of colloidal dispersions in external fields
within the last years is reviewed. Colloidal dispersions play a pivotal role as
model systems for phase transitions in classical statistical mechanics. In
recent years the leading role of colloids to realize model systems has become
evident not only for equilibrium situations but also far away from equilibrium.
By using external fields (such as shear flow, electric, magnetic or
laseroptical fields as well as confinement), a colloidal suspension can be
brought into nonequilibrium in a controlled way. Various kinds of equilibrium
and nonequilibrium phenomena explored by colloidal dispersions are described
providing also a guide and summary to this special issue. Particular emphasis
is put on the comparison of real-space experiments, computer simulations and
statistical theories.

31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio