Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Equilibrium concentration profiles and sedimentation kinetics of
  colloidal gels under gravitational stress   We study the sedimentation of colloidal gels by using a combination of light
scattering, polarimetry and video imaging. The asymptotic concentration
profiles $\varphi(z,t\rightarrow \infty)$ exhibit remarkable scaling
properties: profiles for gels prepared at different initial volume fractions
and particle interactions can be superimposed onto a single master curve by
using suitable reduced variables. We show theoretically that this behavior
stems from a power law dependence of the compressive elastic modulus
\textit{vs} $\varphi$, which we directly test experimentally. The sedimentation
kinetics comprises an initial latency stage, followed by a rapid collapse where
the gel height $h$ decreases at constant velocity, and a final compaction stage
characterized by a stretched exponential relaxation of $h$ towards a plateau.
Analogies and differences with previous works are briefly discussed.

8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs