Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Colloidal dynamics in polymer solutions: Optical two-point microrheology
  measurements   We present an extension of the two-point optical microrheology technique
introduced by Crocker \textit{et al.} [Phys. Rev. Lett. \textbf{85}, 888
(2000)] to high frequencies. The correlated fluctuations of two probe spheres
held by a pair of optical tweezers within a viscoelastic medium are determined
using optical interferometry. A theoretical model is developed to yield the
frequency-dependent one- and two-particle response functions from the
correlated motion. We demonstrate the validity of this method by determining
the one- and two-particle correlations in a semi-dilute solution of polystyrene
in decalin. We find that the ratio of the one- and two-particle response
functions is anomalous which we interpret as evidence for a slip boundary
condition caused by depletion of polymer from the surface of the particle.

14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
18
The categories of this paper are: econ
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
19
The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn