Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two Novel Special Relativistic Effects: Space Dilatation and Time
  Contraction   The conventional discussion of the observed distortions of space and time in
Special Relativity (the Lorentz-Fitzgerald Contraction and Time Dilatation) is
extended by considering observations, from a stationary frame, of : (i) objects
moving with constant velocity and uniformly illuminated during a short time
$\tau_L$ (their `Luminous Proper Time') in their rest frame; these may be
called `Transient Luminous Objects' and (ii) a moving, extended, array of
synchronised `equivalent clocks' in a common inertial frame. Application of the
Lorentz Transformation to (i) shows that such objects, observed from the
stationary frame with coarse time resolution in a direction perpendicular to
their direction of motion are seen to be at rest but {\it longer} in the
direction of the relative velocity $\vec{v}$ by a factor $1/\sqrt{1-(v/c)^2}$
(Space Dilatation) and to (ii) that the moving equivalent clock at any fixed
position in the rest frame of the stationary observer is seen to be running
{\it faster} than a similar clock at rest by the factor $1/\sqrt{1-(v/c)^2}$
(Time Contraction). All four space-time `effects' of Special Relativity are
simply classified in terms of the projective geometry of space-time, and the
close analogy of these effects to linear spatial perspective is pointed out.

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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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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: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph