Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Speed of Light and the Einstein Legacy: 1905-2005   That the speed of light is always c=300,000km/s relative to any observer in
nonaccelerating motion is one of the foundational concepts of physics.
Experimentally this was supposed to have been first revealed by the 1887
Michelson-Morley experiment, and was made one of Einstein's key postulates of
Special Relativity in 1905. However in 2002 the actual 1887 fringe shift data
was analysed for the first time with a theory for the Michelson interferometer
that used both the Fitzgerald-Lorentz contraction effect, as well as the effect
of the air in the interferometer on the speed of light. That analysis showed
that the data gave an absolute motion speed in excess of 300km/s. So far six
other experiments have been shown to give the same result. This implies that
the foundations of physics require significant revision. As well data shows
that both Newtonian gravity and General Relativity are also seriously flawed,
and a new theory of gravity is shown to explain various so-called gravitational
`anomalies', including the `dark matter' effect. Most importantly absolute
motion is now understood to be the cause of the various relativistic effects,
in accord with the earlier proposal by Lorentz.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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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: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat