Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integrable Lorentz-breaking deformations and RG flows   We construct the all loop effective action for WZW models perturbed by
current-bilinear terms of the type $J_+J_- $, $J_+J_+ $ and $J_-J_- $, the last
two of which explicitly break Lorentz invariance. For isotropic couplings we
prove integrability. For the case in which only the first two terms are present
we identify a non-perturbative symmetry of the effective action and we compute
the exact beta-functions. These become identically zero outside a bounded
region in the parametric space.

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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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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: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio