Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fusion rules and logarithmic representations of a WZW model at
  fractional level   The fusion products of admissible representations of the su(2) WZW model at
the fractional level k=-4/3 are analysed. It is found that some fusion products
define representations for which the spectrum of L_0 is not bounded from below.
Furthermore, the fusion products generate representations that are not
completely reducible and for which the action of L_0 is not diagonalisable. The
complete set of representations that is closed under fusion is identified, and
the corresponding fusion rules are derived.

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The categories of this paper are: cond-mat
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The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga