Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Historical Note on the Relativistic Theories of Electromagnetism   Quantum electrodynamics is the well-accepted theory. However, we feel it is
useful to look at formalisms that provide alternative ways to describe light,
because in the recent years the development of quantum field theories based
primarily on the gauge principle has encountered considerable difficulties.
There is a wide variety of generalized theories and they are characterized
mainly by the introduction of additional parameters and/or longitudinal modes
of electromagnetism. The Majorana-Oppenheimer form of electrodynamics, the
Sachs' theory of Elementary Matter, the analysis of the action-at-a-distance
concept, presented recently by Chubykalo and Smirnov-Rueda, and the analysis of
the claimed `longitudinality' of the antisymmetric tensor field after
quantization are reviewed in this essay. We also list recent advances in the
Weinberg 2(2J+1) formalism (which is built on First Principles) and in the
Majorana theory of neutral particles. These may serve as starting points for
constructing a quantum theory of light.

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The categories of this paper are: stat
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
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The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph