Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-Similar Approach to Violent Relaxation   We consider the evolution of an initially cold, spherically symmetric system
of self-gravitating particles. At early times the system undergoes self-similar
collapse of the type described by Fillmore & Goldreich and Bertschinger. This
stage of phase mixing soon gives way to a period of violent relaxation driven
by an instability in the similarity solution. The onset of violent relaxation
is illustrated by numerical simulations and supported by non-linear analysis of
the ``scaled'' collisionless Boltzmann and Poisson equations.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex