Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Consideration of Covariant Quantization of Electromagnetic Field   We examine a covariant quantization of electromagnetic fields by using an
operator derived from a constant scalar that can be called extended Lorentz
gauge. The quantization can avoid an inconsistency between Lorentz gauge and a
commutation relation, which can eliminate the need for introduction of physical
state defined by a subsidiary condition and auxiliary field in Lagrangian
density in Lorentz gauge. By using this quantization and indefinite metric
straightforwardly, all quantum phenomena can be provided without enigmatic and
paradoxical "probability interpretation".

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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: math