Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatiotemporal Intermittency on the Growing Surface of Coupled Sandpiles   The surface of conservative coupled sandpiles in the self-organized
cooperative critical state is found to exhibit intermittency in both time and
space. The spatiotemporal intermittent structure is also found to be a
multifractal. The probability density of sand grain heights on the surface is
an asymptotic power law but with an exponential cut-off. The power spectra of
the time series of sand grain heights show a diversity of low-frequency
components over different sites on the surface and also over different ensemble
samples. This means that the long-term prediction according to the nearby
observations and the history experiences is very difficult in the world of
coupled sandpiles. Unlike the low-frequency spectra, the high-frequency spectra
seem to obey a universal $f^{-2}$ law.

12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an