Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is a truly marginal perturbation of the $G_k\times G_k$ WZNW model at
  $k=-2c_V(G)$ an exception to the rule?   It is shown that there exists a truly marginal deformation of the direct sum
of two $G_k$ WZNW models at $k=-2c_V(G)$ (where $c_V(G)$ is the eigenvalue of
the quadratic Casimir operator in the adjoint representation of the group $G$)
which does not seem to fit the Chaudhuri-Schwartz criterion for truly marginal
perturbations. In addition, a continuous family of WZNW models is constructed.

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The categories of this paper are: alg-geom
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
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The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc