Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy flow between two hydrodynamically coupled particles kept at
  different effective temperatures   We measure the energy exchanged between two hydrodynamically coupled
micron-sized Brownian particles trapped in water by two optical tweezers. The
system is driven out of equilibrium by random forcing the position of one of
the two particles. The forced particle behaves as it has an "effective
temperature" higher than that of the other bead. This driving modifies the
equilibrium variances and cross-correlation functions of the bead positions: we
measure an energy flow between the particles and an instantaneous
cross-correlation, proportional to the effective temperature difference between
the two particles. A model of the interaction which is based on classical
hydrodynamic coupling tensors is proposed. The theoretical and experimental
results are in excellent agreement.

25
The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph