Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 1/f noise in spatially extended systems with order-disorder phase
  transitions   Noise power spectra in spatially extended dynamical systems are investigated,
using as a model the Complex Ginzburg-Landau equation with a stochastic term.
Analytical and numerical investigations show that the temporal noise spectra
are of 1/f^a form, where a=2-D/2 with D the spatial dimension of the system.
This suggests that nonequilibrium order-disorder phase transitions may play a
role for the universally observed 1/f noise.

12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg