Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The $1/r^2$ Integrable system: The Universal Hamiltonian for Quantum
  Chaos   We summarize recent work showing that the $1/r^2$ model of interacting
particles in 1-dimension is a universal Hamiltonian for quantum chaotic
systems. The problem is analyzed in terms of random matrices and of the
evolution of their eigenvalues under changes of parameters. The robustness of
bulk space-time correlations of a many particle system to changing boundary
conditions is suggested to be at the root of the universality. The explicit
density-density correlation functions of the $1/r^2$ model, now available
through the above mapping at two values of the coupling constant, are
interpreted in the light of Bethe's {\it Ansatz}, giving a vivid picture of the
fractionalization of bare particles or holes into ``quark'' like Bethe
quasi-particles and holes.

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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: stat
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph