Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective Motion and Phase Transitions of Symmetric Camphor Boats   The motion of several self-propelled boats in a narrow channel displays
spontaneous pattern formation and kinetic phase transitions. In contrast with
previous studies on self-propelled particles, this model does not require
stochastic fluctuations and it is experimentally accessible. By varying the
viscosity in the system, it is possible to form either a stationary state,
correlated or uncorrelated oscillations, or unidirectional flow. Here, we
describe and analyze these self organized patterns and their transitions.

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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex