Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous dynamics in tracer-particle motions in an
  electrohydrodynamically driven oil-in-oil system   We characterize the super-diffusive dynamics of tracer particles in an
electrohydrodynamically driven emulsion of oil droplets in an immiscible oil
medium, where the amplitude and frequency of an external electric field are the
control parameters. In the weakly-driven electrohydrodynamic regime, the
droplets are trapped dielectrophoretically on a patterned electrode, and the
driving is therefore spatially varying. We find excellent agreement with a
$\langle x^2 \rangle \sim t^{1.5}$ power law, and find that this superdiffusive
dynamics arises from an underlying displacement distribution that is distinctly
non-Gaussian, and exponential for small displacements and short times. While
these results are comparable with a random-velocity field model, the tracer
particle speeds are in fact spatially varying in 2 dimensions, arising from a
spatially varying electrohydrodynamic driving force. This suggests that the
important ingredient for the super-diffusive $t^{1.5}$ behaviour observed is a
velocity field that is isotropic in the plane and spatially correlated.
Finally, we can extract, from the superdiffusive dynamics, a experimental
lengthscale that corresponds to the lateral range of the hydrodynamic flows.
This experimental length scale is only non-zero above a threshold ion mobility
length.

5
The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex