Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fluctuations and the role of collision duration in reaction-diffusion
  systems   In a reaction-diffusion system, fluctuations in both diffusion and reaction
events, have important effects on the steady-state statistics of the system.
Here, we argue through extensive lattice simulations, mean-field type
arguments, and the Doi-Peliti formalism that the collision duration statistics
-- i.e., the time two particles stay together in a lattice site -- plays a
leading role in determining the steady state of the system. We obtain
approximate expressions for the average densities of the chemical species and
for the critical diffusion coefficient required to sustain the reaction.

5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys