Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A fluctuation-response relation of many Brownian particles under
  non-equilibrium conditions   We study many interacting Brownian particles under a tilted periodic
potential. We numerically measure the linear response coefficient of the
density field by applying a slowly varying potential transversal to the tilted
direction. In equilibrium cases, the linear response coefficient is related to
the intensity of density fluctuations in a universal manner, which is called a
fluctuation-response relation. We then report numerical evidence that this
relation holds even in non-equilibrium cases. This result suggests that
Einstein's formula on density fluctuations can be extended to driven diffusive
systems when the slowly varying potential is applied in a direction transversal
to the driving force.

3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn