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Because classical Maxwellian
electromagnetism has been one of the cornerstones
of physics during the past century, experimental
tests of its foundations are always of considerable
interest. Within that context, one of the most
important efforts of this type has historically
been the search for a rest mass of the photon.
The effects of a nonzero photon rest mass can
be incorporated into electromagnetism straightforwardly
through the Proca equations, which are the simplest
relativistic generalization of Maxwell’s equations.
Using them, it is possible to consider some
far-reaching implications of a massive photon,
such as variation of the speed of light, deviations
in the behaviour of static electromagnetic fields,
longitudinal electromagnetic radiation and even
questions of gravitational deflection......... |
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Eccentricities
of the mass center from the geometric center
of two cylindrical source masses used in the
HUST-99 measurement of the Newtonian gravitational
constant G are determined by means of an electronic
balance. Considering a linear density distribution
of source masses as well as the effect of the
air buoyancy, our value of G should be revised
to be 6.6723(9)*10-11 m3 kg-1 s-2, which is
0.036% larger than our previous published value
in Phys. Rev. D 59, 042001 (1999).
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