Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Perspectives on the Relativistically Rotating Disk and
  Non-time-orthogonal Reference Frames   The rotating disk problem is analyzed on the premise that proper
interpretation of experimental evidence leads to the conclusion that the
postulates upon which relativity theory is based, particularly the invariance
of the speed of light, are not applicable to rotating frames. Different
postulates based on the Sagnac experiment are proposed, and from these
postulates a new relativistic theory of rotating frames is developed following
steps similar to those initially followed by Einstein for rectilinear motion.
The resulting theory agrees with all experiments, resolves problems with the
traditional approach to the rotating disk, and exhibits both traditionally
relativistic and non-relativistic characteristics. Of particular note, no
Lorentz contraction exists on the rotating disk circumference, and the disk
surface, contrary to the assertions of Einstein and others, is found to be
Riemann flat. The variable speed of light found in the Sagnac experiment is
then shown to be characteristic of non-time-orthogonal reference frames, of
which the rotating frame is one. In addition, the widely accepted postulate for
the equivalence of inertial and non-inertial standard rods with zero relative
velocity, used liberally in prior rotating disk analyses, is shown to be
invalid for such frames. Further, the new theory stands alone in correctly
predicting what was heretofore considered a "spurious" non-null effect on the
order of 10^-13 found by Brillet and Hall in the most accurate Michelson-Morley
type test to date. The presentation is simple and pedagogic in order to make it
accessible to the non-specialist.
  Key words: relativistic, rotating disk, Sagnac, rotating frame,
non-time-orthogonal frame.

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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph