Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exact S matrices for integrable quantum spin chains   We begin with a review of the antiferromagnetic spin 1/2 Heisenberg chain. In
particular, we show that the model has particle-like excitations with spin 1/2,
and we compute the exact bulk S matrix. We then review our recent work which
generalizes these results. We first consider an integrable alternating spin 1/2
- spin 1 chain. In addition to having excitations with spin 1/2, this model
also has excitations with spin 0. We compute the bulk S matrix, which has some
unusual features. We then consider the open antiferromagnetic spin 1/2
Heisenberg chain with boundary magnetic fields. We give a direct calculation of
the boundary S matrix. (Talk presented at the conference on Statistical
Mechanics and Quantum Field Theory at USC, 16 - 21 May 1994)

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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph