Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lorentz and CPT violation in QED revisited: A missing analysis   We investigate the breakdown of Lorentz symmetry in QED by a CPT violating
interaction term consisting of the coupling of an axial fermion current with a
constant vector field $b$, in the framework of algebraic renormalization -- a
regularization-independent method. We show, to all orders in perturbation
theory, that a CPT-odd and Lorentz violating Chern-Simons-like term,
definitively, is not radiatively induced by the axial coupling of the fermions
with the constant vector $b$.

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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: eess