Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of random dipoles : chaos {\it vs} ferromagnetism   The microcanonical dynamics of an ensemble of random magnetic dipoles in a
needle has been investigated. Analyzing magnetic reversal times, a transition
between a chaotic paramagnetic phase and an integrable ferromagnetic phase has
been numerically found. In particular, a simple criterium for transition has
been formulated. Close to the transition point the statistics of average
magnetic reversal times and fluctuations have been studied and critical
exponents numerically given.

26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg