Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Consistency of isotropic modified Maxwell theory: Microcausality and
  unitarity   The Lorentz-violating isotropic modified Maxwell theory minimally coupled to
standard Dirac theory is characterized by a single real dimensionless parameter
which is taken to vanish for the case of the standard (Lorentz-invariant)
theory. A finite domain of positive and negative values of this
Lorentz-violating parameter is determined, in which microcausality and
unitarity hold. The main focus of this article is on isotropic modified Maxwell
theory, but similar results for two anisotropic nonbirefringent cases are
presented in the appendices.

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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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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: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an