Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Spectral Problem for the q-Knizhnik-Zamolodchikov Equation   We analyse the spectral problem for the q-Knizhnik-Zamolodchikov equations
for $U_q(\widehat{sl_2}) (0 < q \leq 1)$ at level zero. The case of 2-point
functions in the fundamental representation is studied in detail. The
scattering states are found explicitly in terms of continuous q-Jacobi
polynomials. The corresponding S-matrix is shown to coincide, up to a trivial
factor, with the kink-antikink S-matrix in the spin-1/2 XXZ antiferromagnet.

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The categories of this paper are: patt-sol
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
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The categories of this paper are: econ
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int